I have A+ and Network+ certs, and hoping to have acquired Security+ before the end of the year.

I know I gotta begin somewhere though. So, from people who have experienced or are employed currently in IT, would it generally be better to start off at at a place like Best Buy/Geek Squad, Staples EasyTech, etc OR a local repair shop? as far as pay and how management/coworkers are
What kinds of tasks and technical situations does a PC repair person encounter?--what kinds of technical problems are they expected to be able to resolve? I have looked at job descriptions, while browsing around for it, but I'd feel more comfortable from direct replies of those experienced in IT.
Edit: Also, what exactly is a "Help Desk" job, from those who have worked in that or similar position.