G.,
Some moms claim to get their little ones on a schedule early on, but I don't think its realistic. The advice about no more than 2 hours awake is what I followed and it worked pretty well. My daughter (now 18 mo) would get up around 7 am, nap around 9 until 11 (although the length of the nap varied - and still does), awake until 1, nap until 3, awake until about 6, then slept all night (waking once or twice to feed until about 7 months, then she slept through the night).
I found that as you try to implement a "schedule" (actually, its more like a routine), you have to read your baby and see how she responds. Maybe an hour and a half is better for her, or 3 hours. Over time, she will need to adjust the routine, but she'll let you know somehow, as long as you're paying attention.
One book I really appreciated is "Healthy Sleep Habits, Happy Child". You can skim through a lot of it, but there are some gems of advice based on scientific sleep research. And there are chapters for the various age ranges when sleep needs change from birth through school-age kids.
Also, sleep patterns don't seem to regulate until AT LEAST 4 months. I wouldn't get too frustrated until you're baby is 6 months or so. I know it's not easy to live without a routine, but you'll just be wasting futile effort until that point.
Good luck!