Advice? (Please don’t read if the idea of female masutbation makes you uncomfortable)

So ive been masturbating on the occasion... only really clit stuff but I wanna try sticking my fingers up? Or finding something to stick up there? Any advice on how to get it up there? (I’ve never used a tampon before so I don’t know how that works... incase y’all say it’s like that...)

Also my boyfriend and I have talked about him possibly fingering me? I wanna know what it feels like by myself before I let him do it? Although the next time he comes over I’ll possibly be on my period so i don’t think I’ll let him do anything to me if I am but I still wanna be prepared...