what will you do with bitcoins you received? they're yours to keep?
I don't think there will be decent amount, as I said you should send small amounts, it's just for distribution of coins. If the balance becomes big it will be spent for further development after the initial launch. I could ask you to send bitcoins to an unspendable address, but I prefer to have a chance to send bitcoins back to their owners in case if Nxt is not launched due to different reasons.
basically you create nxt, then ppl will pool their bitcoins together so they can buy nxt from you?
then you will distribute 100% of created nxt according to the bitcoin contribution?
then you will distribute 100% of created nxt according to the bitcoin contribution?
No. All nxts will be in the genesis block waiting for someone who knows the secret phrase entered on the 1st step. I won't be able to take these coins because the network will reject any non-legit transaction. Everyone will get nxts in proportion to the bitcoin contribution.
how many bitcoins are you going to contribute? (are you going to keep the coins you contributed yourself? 
)
or you will take a creator cut (certain %)
)or you will take a creator cut (certain %)
I don't know how much I will contribute. This depends on the price of Bitcoin and some other factors. These bitcoins, like the others, will be used to pay bounties for development. No creator cut.