Read, read, read. There is a ton of great info on this site. There is also how to brew by John Palmer available for free on the Internet.
The effects of sanitation can not be over stated. Get yourself either some PBW or Oxyclean Free along with either Star San or Iodaphor. Use the PBW/Oxy to clean, and the star San to sanitize. Doesn't matter how good you brewing process is if your sanitation is sh!t, your beer will more times than not be sh!t.
Next on the list would be temperature control for fermentation. Make sure you get the sort chilled down to below 70f before pitching the yeast. After that, get yourself a tote or something similar that is bigger than your fermenter to make a swamp cooler. Fill the tote with cold water and put the fermenter in the water bath. Keep the water bath water around 62f using ice bottles of necessary. If you have a room or closet that maintains a temp of around 62f this will not be necessary.
You can also get yourself some brewing software. If you have the extra $25 you can get beersmith, else, there are plenty of free options available. Mybrewco.com is one. These will allow you to enter ingredients, both extract and all grain, and tailor a recipe to make sure they fit within the parameters of a selected style.
Most importantly, have fun.