Welcome to the forum.
Here are a couple of links that you might like:
Guide for beginners
Reefkeeping FAQ
Both are articles from ReefCentral's homepage.
I agree with the previous posts in regards to your undergravel filter. You only have a small amount of rock currently...no better time than now to get the UG filter out. Are you powering it with an air pump or with powerheads? You could use any powerheads for circulation. If an air pump is being used, put it in the closet with the UG filter. The Tetra hang on back filter is ok for pulling solid materials from the water column (I actually like the Tetra/Whisper pads better than Emporer pads for water polishing), but make sure you don't leave the pads in too long.
The easiest (and cheapest) way to cycle a reef tank is with live rock. Live rock is expensive, but you have to have it anyway...so use it to cycle your tank. You can purchase sand from a local fish store (LFS) to seed your tank with critters. Or better yet, find a hobbyist near you that can spare a cup or two of their existing sand.
I wouldn't buy a hang on skimmer if you plan to upgrade to a sump. Plan your future filtration equipment according to your sump plans.
Six lbs. of rock isn't going to provide enough bacteria to cycle your tank. At least, not enough to support livestock. You can add rock in a lump sum or slowly...up to your budget. If you add it slowly, you can go through "mini cycles" each time you add rock. Not a bad thing really, just requires more patience. One sponser of ReefCentral sends 1/2 of a rock purchase to cycle a tank and the other half after the cycle is complete. You can do the same thing with rock purchased locally.
I also agree with Paul in that I would find and meet some of the other LFS owners. I don't want to slam your current store, as they may not have fully understood just how new your set up is. If they did know, I would definately look for a store with a different outlook on what to put in a brand new tank.
I would start with reading articles and books. I like the articles here because they're free.

ReefCentral also has a "new to the hobby forum." It can be useful as well.
Good luck with your tank! Go slow, research, ask lots of questions, plan your equipment in advance, and have lots of fun!
Ronnie