What do you need to know?

You can get a basic setup from mrsolar.com, or harborfrieght.com (cheaper but of questionable quality, tho a lot of people say great things about them). You need a solar panel, some kind of charge controller, and a 12v deep cycle battery, or two 6v batteries wired in (um, series?) which seems to be better if you want to store larger amounts of power.

Hey Josh,
There is a TON of info out there that'll help you to design a system to fit your needs. One book I've found VERY useful is "Managing 12 Volts" "How to Upgrade, Operate, And Troubleshoot 12 volt Electrical Systems" It's by a Harold Barre and I believe it's still avaliable from Summer Breeze Publishing out of Redwood City, CA.
Found my copy at a Camping World store.
The book takes you through the basics and gives you the info you need to figure exactly what you'll need to run the load(s) you want.
Did I see in your post that you wanted to run some type of heating system? If you're thinking of trying to run some type of electrical resistance heater off of a battery system....UH UH! you'd need MASSIVE amounts of battery capacity AND generating capacity to re-charge such a system, impractical is the word that comes to mind. If you want to run a circulating fan for a propane fired heater, that's a whole other ball game...FAR more practical. Look at propex heaters, they make a compact, propane fired, thermostacially controlled heater that'll fit just about anything.
For the LED lighting...I picked up a set of LED lights at Advance Auto parts. It was a set tthey had in their "Bling" section. It was a string of single LED's made to go under the rocker panels outside of the vehicle. I set them up inside my 82 VW Westfalia Camper. Nice mellow light, you can see by them and the string of 8 draws under 1 amp! They had "sticky" backs so I was able to place them without drilling. That was 2 years ago and they're still in place.
Also, don't skimp on the battery(s) ! get the best one(s) you can afford that'll suit your needs. Read the book(s) that'll give you some ideas about which type(s) of battery is best suited to your particular needs and system.
Marine supply stores are another good source. Some items can be pricier, but a lot of items made for marine use are better quality and will last longer than something coming from the typical RV supply store.