I think he was talking about .10/.25 LIMIT hold'em. In this case, yes, you should wait until you have at least 300bb since the swings can be massive when playing limit, especially at these levels (where you have no fold equity).
My general strategy now (I am in the same situation as you, but I've played live for a long time) is to practice safe BR management and concentrate on limit ring games and NL SNG's. I feel these are the two games where I can constantly profit online. Another game I also play is 5 card-draw at PS (PL SNG) since the competition is crazy soft and you can multitable them easily (calculate odds
, draw, bluff if necessary and correct, rinse and repeat).
I'd also recommend that you pick up some books on the games/stakes you'll be playing. Small Stakes HE seems to be the norm for limit players these days, but the Sklansky books can help you too (TOP, wich can be a very good beginner's book if you have some experience*).
So, Reading + Studying your game + Sound BR management + Playing well = profit.
* I'm used to reading thesis on Medieval Literature so it was an ok reading.