This is an old thread, but many people are still interested in the subject, so here is my take on it. PokerStars defice micro stakes MTTs as anything with a buyin of 4,4$ or lower. The fields are usually large, and therefore a reasonable starting bankroll is 500$. This allow you to play a mix of 1,1$ to 4,4$ MTTs. You will then have close to 200 times your average buyin, which should be enough, if you are actually a winning player.
A simple and effective system is then to never play for more than 1% of your bankroll. So if you drop below 440$, you stop playing 4,4$ MTTs, and if you rise above 550$, you can start adding some 5,5$ MTTs, but you also still play a lot of 2,2-4,4$ MTTs. In this way you actually have more than 200 "bullets" in the gun, and the worst, which can happen, is, that you temporarely need to move down.
With anything much less than 500$ its really best to start in the SnG lobby, even though to be honest I personally got a bit tired of my "challenge", where I went back to the 45-180 man SnGs on Stars. But if you really only have say 100$, this is still the place to start on PokerStars, unless you choose to play cash games.
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