This girl we've been dating for 1 month

we go out and make out at the end of the night in the car

how do i initiate sex or a blow job at least?

start by going from in the car to her room?

U need TO arouse HER until the very point that she would (and will if u do it correctly) say to u: lets go the room i want to do it right now

to do this (arouse her) it differs from women to women but usually kisses on the neck, and touching all her body (back, butt, legs, thighs, forearms) should do the work

if u want a more detailed answer on how to step by step escalate and arouse her feel free to pm me

seduce her... kiss her than go to second base, than try the first base... eventualy she will want it

You could eat her out, although there's a serious danger that she won't reciprocate, so it can become AFC territory. If she's too young and has hangups about full on sex though, starting with oral sex is a good bridge to the final deed, because it gets her responding to orgasms physically rather than all these bullshit mental ideas about sex being "wrong" or whatever. For some reason chicks seem to think oral sex is "more ok" or "doesn't count." Giving up their box is like a really big deal to the younger ones. Conversely, I wouldn't put up with this crap from an older woman, I'd just fuck her.