need help NOW.how do you determine how many stamps to use when you mail stuff?

i need to mail in my caps and order form TODAY.
i bought a foam letter packaging because its the only envelope that it can fit in,
but how many stamps do i use??
ooh, and will something happen if i put too much stamps..??

you will have to weigh it – so unless you have a small scale, go to the post office – it is 41 cents for the first ounce – if you guess you’ll probably be wrong. most post offices have a scale where you don’t have to stand in line.

good luck