Here's a really good guide if you're looking for PvE guides. From gear priority to rotation .
http://dulfy.net/2014/01/04/swtor-sawbones-scoundrel-healer-class-guide/
Righto except it's the 21st not the 20th. Also, no matter when you redeem your code before the launch. The 30 days free starts on the 20th (or 21st if you get it late).