Go through the manual and try out one feature per day/week/whatever. Play with it exclusively until you get the hang of it. They'll eventually sink in and become second nature.
Also, get a big memory card and keep shooting. If it seems interesting at all, shoot it. Then shoot from a different location, angle or whatever interests you. Take lots and lots of photos. Digital is a godsend for that. I used to be cautious with 35mm, shooting 36-72 shots a day at most. Now, I think nothing of plowing through 500-600 photos in a day, sometimes as much as 1,000.
You have good lenses. I'm not familiar with the Sony lineup, but you might want to consider a prime lens. I have a f/1.8 50mm prime Nikon that gets a lot of use. Nice little lens and it produces sharp, natural photos.
Did you get a flash with your kit? If not, it's worth investing in an external one. Internal flashes are OK in a pinch, but usually not powerful enough. Indoors, I like to bounce light off ceilings and walls and outside, it makes for good fill.
Get a spare battery, too.
