Whats the difference between saying "My jsme" and "jsme"? i have 0 background knowledge of czech, just doing it for fun! So a lot of the grammar is confusing for me.
If the subject is a pronoun, it's usualy omitted if it's not confusing than...
No difference. The pronoun is used only in the case of emphasis, like:
"Ne vy, ale my jsme ..." (Not you, but we are...).
Why isn't it muze?
You mean "muže"? Like:
"Vidíš ty muže?" (do you see the men) - its Akuzativ (4.p)
but "Jme muži" (we are men) is Nominativ (1.p)