Help advice FTM

I'm going crazy idk how to buy baby clothes. Lol seriously I dont. Its just me and my boyfriend trying to figure out these things.

Idk how much NB clothes to buy or what sizes etc...

Do I need alot of undershirts? What about diapers? What sizes how many do I need?

Crib sheets? Is one enough?

If I'm planning to breast feed will I need bottles?

I'm having a boy by the way.

Plz anybody help!

Feel free to let me know just about anything lol.