CS5 was released Feb, 2010... 2 years isn't really possible. I guess you mean you've used CS4 then...
I can help you but i'd recommend just watching YouTube videos. You can add me on skype and ask me about stuff but watch some YouTube.
Here is some youtubers i have learned from:
AcrezHD
12obot
Stratzeh
MaskedGraphics
EpicGFXTime
xApexPred
This is all just youtube.com/username