Ooh, nice bike! I test-rode a new Dolce and really liked it. (We'd like pictures if you care to share!)
Anyway, I don't know if there was an SRAM-equipped version in 2005 (there should be something on there that will tell you what the shifters are). The principle is the same, though:
Left hand (when you're on the bike) takes care of the front half of the drivetrain, ie, which of the two or three chainrings you're in. The big outer lever makes it harder (bigger chain ring(s), good for going really fast, but potentially harder on your knees). The smaller lever (black) located under that will shift the chain to the smaller, easier chainring(s)--for helping you get up hills, or just cruising.
Your right hand takes care of the back half, and you'll probably be using this more. It's reversed--pressing the outer lever makes it easier by shifting you to a larger cog. The inner lever makes it harder.
ETA: If your bike came with the weird Shimano Sora-type shifters (the kind with the trigger lever on the inside of the hoods), that replaces that small lever for each. Just press those. Pretty intuitive.
To use either set of shift levers, just press them in toward the stem. So you nudge your left (front) shifters to the right, and your right (rear) to the left. It takes a certain amount of practice to get the touch just right, especially trying to shift into the big chain ring if you have a triple. You need to press firmly and decisively. (Edit: I should have my directions right. My bike came with the trigger shifter levers I just described, and my spatial reasoning skills aren't great.)
Re: Pedals. I prefer metal platforms to the plastic ones because the plastic ones have no grip. If you've got a bike shop you like, go ask them. I'd consider seeing if you can get a set with toe cages and straps. You can always take the straps and cages off. Just remember where the screws are! The other option is to see if you can get a pair of BMX pedals, which have pins for better grip. They'll chew up your leg, though, if you're not careful. (No personal experience with this, but I know of others...)
Hope that helps!