slick

I know thats not really the question to be asking here, but I am looking for some advice on getting the right clubs.
My sister bought me a set of clubs before she moved a month ago. I mentioned plenty of times that I wanted to learn to play, but she made it possible with the clubs. However, after doing some research, I quickly realized that clubs are more or less made for you based on certain criteria.
Now, I am not very good, in fact, I suck. I would like to take lessons, but I need to make sure I have the correct clubs before doing so.
I went to a local golf store today, to try and get help. Seemed as though the person working was showing me the most expensive set of clubs, which I wouldn't mind owning, but not when I am no good at the game and wouldn't notice how good they are. I didn't really get much help there.
I am going to make a trip to another store, but would like to get a feel of what I should be asking, or looking for in a set of clubs.
Can someone please help me out in this? I don't want to make a bad decision.

For those that would like to know, here are the clubs that I have currently:
Nicklaus airMax DPT 460 Driver (1W - 10.5 degree loft) Graphite
Nicklaus airMax DPT Fairway (3W - 15 degree loft) Graphite
Nicklaus HiMax Hybrid (3W - 21 degree loft) Graphite
Nicklaus EZ UP Irons (3-PW, SW) Steel
Ping G5i Anser Putter

I know that there are places that can have me fitted for clubs, how does that work?

Thanks in advance for any help.