[Vince.]

$400 for 50NL can be a little short, but this is fine if you don't mind losing most or all of that initial deposit if you start out running bad. If you want to be safe with your roll, play 25NL with that $400 until you have 20 buyins for 50NL ($1000). 20 buyins for each level is usually the standard for NL games, however you should keep more buyins than 20 as you move up in stakes, because the variance is higher.