Make a good website with original content. Generate some traffic and apply once it is six months old. That is the best way.
There are other ways as well. Squidoo and other such sites. Just make a couple of lenses and then apply for the adsense program.
Yes you can apply through adsense revenue sharing websites as well. That is an easier method but not the best method.
make a good website of about 15 to 20 pages but with your original content not copy paste....dont use any flash content like flash header and flash navigation in your site and apply ...best of luck
One of the most important suggestion that i would like to give is that for every website make a different adsense account so that in case your adsense account gets banned your income from other sites remain safe for you. I hope all other will agree too?