What size tank do I get and for the size tank, what should I put in there..
Go for the biggest tank you can afford and have room for.
I think I am probably more interested in the invertebrates but I know if I put to much of one thing in, the ecosystem will collapse.
You can do an invert only tank without a problem.
where do I get the saltwater. Pretty much, everything. Food, lighting, # animals, the whole thing.
You buy ro/di water, you buy salt from online your lfs and mix it.
Pretty much, everything. Food, lighting, # animals, the whole thing.
Okay, go buy a book, then come back and ask questions. Read post that are here. There is no one answer to this question. You can't just say 55gl, 7 fish, feed brine. Some fish don't get along, and some fish you can't put in smaller tanks. Fish eat different things to. Light will depend on what you want, if just fish, then regular lights are fine, if you want corals then you need different lights.
When you have a free day, leave the money and credit cards at home, and go to a few fish/pet stores. see what they have and what you like. DON'T buy anything. Be careful of what your lfs tells you, remember, they are trying to make money. When you have more specfic questions, come back and ask.
How much money and time do you have?