masturbating

so I'm just gonna start of by saying it: I'm 12 and haven't started my period yet . However, I started masturbating recently and I usually use porn to help me do it. I have an open relationship with my mom about this sort of thing but I haven't told her yet so I figured I'd just ask on here:

are there precautionary steps I need to take before using pornhub/xvideos? I don't have an account on either and just use an incognito app (firefox focus).

are there sanitary things I need to do to stay safe while masturbating?? I wash my hands before and after and I only do external stimulation but idk if I need to do something more to prevent infection.

also it's probably just because I'm still young or something but I don't think I've ever really had an orgasm for reals?? How could I achieve that?? I seem to meet my climax (not really an orgasm tho) after only like 2-5 minutes and I was wondering how I could make it last longer.

if yall could just lemme know in the comments about these things I'd be super appreciative! kinda scared to post this tbh but I think it's something I'd benefit from.