Sending monero
You will need the standard address you want to send to (a long string starting with '4'), and possibly a payment ID, if the receiving party requires one. In that latter case, that party may instead give you an integrated address, which is both of these packed into a single address.
Sending to a standard address:
transfer ADDRESS AMOUNT PAYMENTID
Replace ADDRESS with the address you want to send to, AMOUNT with how many monero you want to send, and PAYMENTID with the payment ID you were given. Payment ID's are optional. If the receiving party doesn't need one, just omit it.
Sending to an integrated address:
transfer ADDRESS AMOUNT
The payment ID is implicit in the integrated address in that case.