can i buy a sihtload of NFEs and then use the accumulated points to buy a team of ubers?
First off, no ubers in this tournament.
Second, you must use your 10 initial pints to purchase Pokemon for this round, but you can only purchase 6. (although you do not have to spend all of them)
So, you can purchase 6 NFEs if you wish, but that would make your round one match a real challenge, although you'd be greatly rewarded if you succeded.
And yes, you must battle under your Smogon username.