First, STOP thinking about livestock. You need to square away your system first. I know the web is a great resource, but the book is great and consistent. You should really get it.
Also, let me say I don't think anyone is particularly out of line with their strong words in regard to your choices.
But, I also think as a community we can (and should) look toward some solutions to the predicament Sesheru has created for him/herself.
While you have certainly created a difficult beginning for yourself, it is quite possible that the livestock can be saved. If you pick up a small tank (~10g) at the LFS and move your power filter over to it you should be able to create a cheap quarantine tank (something you really need to have anyway). What you will want to do is leave the tank bare bottomed, add several different size (length and diameter) PVC tubes, a heater, and the power filter. Fill the tank with properly mixed saltwater and acclimate your inverts and fish to this tank. Do consistent (maybe as often as every other day) water changes to keep ammonia/nitrites/nitrates in check - using your test kits will give you an idea of how often is necessary. The fish, imo, should make it without a lot of trouble. The inverts are iffy, but it is going to be way better than throwing them in with your live rock.
Meanwhile, you will need to cure your live rock (read the article again and ask questions if you are confused) in your other tank. This could take a week or a month or more. While you are doing that, you need to get rid of the three filters you have (the ones we told you to get rid of in the other post) and replace them with some good quality powerheads.
You say you have simply made a beginner's mistake, but even a beginner must be wise enough to ask questions when things seem unclear. I know that it is exciting to set up a new tank (especially your first saltwater tank), but the reality of saltwater is that it does take careful planning and small mistakes can lead to large scale disasters. It is also a very slow process. It will take months (or years) before you really have a handle on your tanks water chemistry and really understand what is going on. You have to be able to slow down, have patience, and allow things to develop slowly if you want to have success. Simply getting all the proper equipment together (which you haven't even done, despite asking us what you needed - and being provided with good answers) does not mean your setup will work without an understanding of the principles behind it. Freshwater is forgiving. Saltwater is far from it. You need to own up to the responsibility that comes with maintaining a saltwater tank. Simply saying "I'm only 13 and you guys didn't tell me everything" isn't going to cut it. To truly understand the tank you intend to keep you must assemble the knowledge behind it. I suggest you clearly plan out your tank, step by step, and then post your plan here. We can then fill in any blanks. A great way to find an example of the proper steps to take in setting up a tank in one convenient place is the same book everyone above is recommending: The New Marine Aquarium.