Bankroll, bankroll, bankroll. Without it you're at the mercy of your first big negative swing. Particularly the players that have lower win rates than the more profitable members of this board.

I've taken mulitple -$200+ swings at $25NL/PL and I've heard lots of stories of solid players taking -100++ big bet swings at limit. So far my worst limit swing was over -50 big bets. That being said, I suspect Tanaka, Xianti, Eric and our better SnG players (hard to compare one to the other) all have higher win rates than I do.

If I had to build a bankroll on a minimum investment. I would buy-in for $200 and play Party's .5/1 limit game to get up to $500 (about 6k hands at my win rate, being new to limit, plan on 20k hands.) Then I would start to mix in a 2/4 game or 6 max $25 NL.

The other key to getting a bankroll going is GAME SELECTION. If it's looking a little rocky leave. This isn't the time to see where you stand against other rational players.