This site is awesome for finding hikes.
http://www.trailpeak.com/index.jsp?cat=def®ion=ab
Same with this one -
http://hikealberta.com/
Here are a few easy ones that are close to home, should help you warm up.
Make sure your boots are worn in good, nothing worse than breaking in new boots on a new trail. Ouch.
Grab yourself some hiking poles, I can't hike without them. I scored a pair of light weight poles from Wholesale Sports in deerfoot meadows for 30 bucks last year (clearance). Don't spend a bunch of money on poles, they will get damaged or lost.
I also recommend some bear spray, I got mine from Campers Village on Macleod trail. It was only $25.00 or so. It's better to have it and never use than need it and don't have it...
Have fun!