It doesnt matter where you start, although not playing at party or one of its old skins is the best option. You're first target is $500. Doesnt matter how you make it whether sngs or ring or mtts, but you need $500.
Mostly thats done through griding at 10nl or through sngs.
Once you have $500 visit the online poker rooms forum and check out easyT's 25nl guide. You have 20 buy ins and a safe roll and by follwing his guides you can easily turn over nearly 3k in about 8-16 weeks.
After that, join the band who are chasing bonuses everywhere. Bonus whores is good for reloads and also find a good rakeback site for each site you visit. Otherwise you're losing out on more free money.