I have a lot of advice but I'm going to make a lot of assumptions based off of your initial post. I’m also probably going to use some buzzwords that every person on the left has a different definition for. Feel free to ask any clarifying questions you need.

We’re currently discussing writing a manifesto or something of the sorts. How do we do that? What do we include?

It sounds like what you could use is a Points of Unity document. Pretty much all you need to do is talk amongst your membership and figure out what things you agree on and that you think are absolutely vital to the future success of the org. Then, you just list down some pithy statements (e.g. "we are for socialism and against capitalism"), and follow each of them up with elaboration, simple, yet effective definitions (e.g. "socialism is a classless, stateless society..."), and maybe some reasoning (e.g. "we are for socialism because it directly confronts the exploitation inherent in the capitalist system..."). These points can cover what type of work you do or don't want to engage in, (e.g. electoral campaigns, mutual aid, base-building, etc.), what groups you’re willing to work with (are there any major parties that you would absolutely never collaborate with?), and what kinds of behavior aren’t tolerated (this one should be elaborated on in a Code of Conduct if you don’t have one from the larger party). These points should be things that you are all in agreement of (hence the whole unity thing), if there’s some debate about something, table it for the future. The Points of Unity should be a living document, after all, and members will hold the right to amend them through official proposals and votes in the future.

We want to do outreach and start bringing more young people in. how the hell do we do that?

Outreach is a tricky thing to do well because it takes a lot more work than just getting people to show up. You need to be able to effectively onboard new members and that means answering the following questions:

• Who are we?
• What do we do?
• Why do we do it?
• How do we do it?

An effective onboarding process decreases the amount of time it takes for someone to feel like they are part of the group. It takes a hot minute for people to feel comfortable putting forward their ideas and energy, both of which you’re going to need to build socialism. Because of this, I’d say that while you’re still getting started, don’t focus quite as much on outreach. Leave ways for the people who are already going to be interested to find you and contact you, and maybe try to actively recruit some friends who will, at the very least, feel comfortable with one person in the org. I also think that in the long run, the best outreach you will be able to do will come from the work you do. You’re probably going to network with other organizations and activists as time goes on and you should absolutely use these connections to find new people. I’d also recommend on top of the volunteering and protesting to find avenues of organizing that directly impact the youth in your area. Do the student employees at a local university have a union? If not, then start looking in to what it would take to effectively start a unionization effort (Side note: do not rush in to any unionizing effort. People’s jobs are at stake and you need to take the time to ensure that the people you’re trying to help don’t get hurt by your effort. Try reaching out to some labor organizers if you ever have any questions about what it would take to start a union). If you take on these kinds of projects, you’re going to start engaging with people directly which will be an effective way to bring them into the fold.

Other people are covering some of the other stuff I would have covered, so I will leave off with one last thing to do: Political Education. If the party doesn’t have a formal poli-ed program, just start reading stuff with your comrades (hell, podcasts, videos, and just about any type of media can be effective poli-ed if you take the time to have a good discussion). If your party doesn’t have an official tendency (and even if they do), use texts from multiple tendencies. Take the information in whatever text you’re using and start applying it to the world around you. You don’t have to agree with every point the author makes (disagreement is a useful tool amongst comrades), the most important part is that everyone has experienced the same thing and taken the time to discuss how they feel about it. Each poli-ed session is something that you can reference with each other going forward and will help out a lot in the long run.

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When just starting out I think you should try and find some campaign to organize around, and then you can tell people to come to your org to help out with setting up flyers, protests, etc. Later on you might try and make some unions like maybe a student union but to start out I suggest trying to do some simple, winnable campaign even if it's largely symbolic

Step one: Don’t be cringe

Step two: Get some Commie himbos and bimbos to join. Make socialism sexy. Present your Hasans, Mohammads, and Stalins, and not your Christmans, V*ushs, and Trotskys. If you cannot find any Commie himbos/bimbos, become one.

You don’t need a manifesto, but you might need some internal small rulebook/charter. Like do you accept donations/what you do with them? Is your purpose mainly spreading your org views or helping people (like propaganda of the deed, only the deed is not, you know, the deed), that kind of thingy.

You have to have some clear practical purpose, like dunno, “we help homeless and provide exposure to working accidents, if worker in question is fine with it”, if you’re small org having only lofty goals might be discouraging, so start small-ish