Obviously I won't share where I've gotten my files over the years for media but as a physical collector as well, the prices for some bluray collections of things is outrageous and would like to make my own that look somewhat professional. I have a bluray burner and blank bluray discs.
You need something like tmpgenc to make Blu-ray compliant discs
I don't really understand this though, the cost per GB of a blank double layer bluray is higher than an hard drive. Just store Blu-ray images (or direct rips) on the disc and access them on your device. In this way you don't need to worry about disc damages, bad burns, lost media, and so on.
At the price of a disc + the time to source and take a full disc rip + the time to source a good scan of the cover and disc surface + printing labels and covers + the bluray box (you said you want to look professional so you aren't planning to just keep them in a spindle and use a sharpie, right?) You're basically paying almost the same of a real disc
so if you burn a ISO of a movie for instance on the blank bluray disc, the bluray player will recognize it as a typical bluray movie?
If you can find Blu-ray isos, yes (if it fits your blank bd25 or bd50, if it's one of those newer bd75 or bd100 it must be re encoded)
But they're not easy to find