Get a field guide to native mushrooms in your area, they tend to be very helpful for a start. In all honesty though the way I learned best was through practice. Whenever I'm out in about I'll try and identify the mushrooms I see and after a while you start recognizing them on sight. Any service that offers mushroom identification through picture is bound to fail you eventually and usually quite often, some of the core ways of identifying mushrooms involve taking spore prints, checking for bruising when handled, and gill attachment; none of which are easily in just one or two pictures. It's better to have a book imo.