Awww lookit the cute face

Good job.
When you get your clippers I'd reccomend you also get one of the coolant sprays to spray on the blades (I personaly like the Andis cool care over the oster myself). Not only does it disinfect and provide a little lube to the blade (you'll still need to clean and oil it though) but it helps keep them cool when they start to warm up. Mostly that is more important when you do feet and face at the same time as most of the time by the third foot my clippers are starting to warm the blade up. The other option would be to buy a couple extra blades and switch them out when they start to get warm.
With just doing Ollie you should be ok with with a single speed clipper. I have a backup pair made by Andis, it's blue and cost me 70 or 80 bucks at Sally's beauty supply, it also has detachable blades and came with some gaurds with I use for my husbands hair lol. They have the exact same modle for pets BUT of course the pet version is for no reason at all much more expensive. So dont be afraid to use good quality human clippers with detachable blades, they are basicly the same thing

Just within petsmart I think they carry a couple of decent single speed andis clippers as well as double speed ones.
Here are the ones I bought at Sally's
http://www.sallybeauty.com/Andis-Clippers/SBS-395490,default,pd.html
They come with a ceramic hairstylist equal to a 40 blade. You DON'T have to use ceramic blades, they take all types of detachable blades so whatever blades you get will be fine. I swear I saw this in a petstore a couple weeks after I purchased them for over 100 bucks. I use mine as an emergancy back up pair, just in case, and to clip my girls FFT since it's really quiet and I can chatter at my husband while I'm doing it.