Ok, if you're still here you're going to be assimilated into this addiction soon.
As the others have said - yes it can get expensive. Some things to think about.
1. Albums are probably going to be the single biggest investment. For the 8.5 x 11 and 12 x 12 they range from ~$10 for the spiral bound ones that are fairly inflexible to upwards of $50 for some of the specialty ones from Creative Memories. In any case make sure that the pages and page protectors are acid free. The strap hinge or post bound tend to be the sturdiest and most flexible but this is a VERY personal preference as evidenced in a recent thread.
2. Don't try to go it alone as you get started, as it can be really overwhelming. Take a class or find a friend. Magazines, books and websites can be really helpful in getting the ideas flowing.
3. Have some sort of organization system that can grow with your involvement. I started pretty simply putting different sorts of supplies into various ziploc bags held in a relatively small plastic storage basket. Today it takes a room! with lots of other storage options and a long table!
4. Start simply. You don't have to do the fancier designs. Simply matting your photos with a complementary card stock and perhaps a simple edge to the page is a good way to get started. And don't forget to journal.
5. Have an idea how you want to proceed. For instance - do you have a special trip you want to scrap? That is a great way to start. From there you can decide how you want to organize your books. Because this will not stop with one book. It feeds upon itself and soon all of the photos in the magnetic and sleeve albums you now have will be calling to you to scrap them! LOL!
6. If you present storage system for your photos is in shoe boxes, the envelopes from the developer, etc. take some time to organize them first. We had a scrap on New Year's Day with ladies ranging from a many year veteran to a brand newbie in much the same boat you're in and we all managed to complete one page that afternoon! The veteran was doing a fairly complicated layout with strips of a panoramic photo interspersed with her son's senior portrait proofs. I was working on a football layout that was moderately complicated with borders, matted photos and themed stickers. The newbie put together a simple page with half a dozen photos of her oldest daughter and several of her friends - it was very simple. Then she spent several hours sorting a tupperware box full of pics into a pile for each of her kids, general family stuff, and a particular trip. She said afterwards that she felt like she can get going "for real" now.
7. Check in with this board often and ask questions. Most of all HAVE FUN.
Deb