Take care of your physical appearance. No matter how much women would like to admit otherwise, looks are an important part of the dating game. Bad body odor, smelly breath, and greasy, unkempt hair are simply not attractive to most women. Shower regularly,brush your teeth twice a day, and stay in shape. While you don't need to be the best looking person out there, you do need to make a good first impression.
Take pride in your clothing. Again, you don't need to be stylish, but clean, unwrinkled clothes are always better than the opposite. Avoid wearing the same thing every day, especially if it's just sweatpants.
In addition to making you more attractive, taking good care of your physical appearance will boost your self confidence, which in turn, will make you more attractive, boosting your self confidence, and so forth. While cockiness is never a good thing, knowing that you've got good qualities will make you much better at marketing yourself.