Hi Angie!
You'll get lots of advice here! PoolDoc (Ben) has a whole plan for how to set up your initial water chemistry that's neither hard nor expensive.
My first pool was a 15' round Intex Donut that I replaced about a dozen years when I upgraded to a 40'x16'. But we had 3 solid fun years with the Intex.

Important starting things:
1) You MUST have a level site for the pool. Anything more than an inch across 20' will be a problem, and really 1/2" should be your tolerance. Be very careful of sticks, rocks, etc, that can poke a hole in your pool. A base of a couple inches or more of sand is best. You can put an Intex on grass if it's level, but Intex used to sell a ground tarp to protect the pool's bottom.
2) Electricity must be close enough for your pump and must be ground-faulted. You can get a plug-in outdoor weather resistant time for $18-$20 at Home Depot and you'll love having it.
3) Read how our B-B-B system works. With your SWCG, it will be a BIG help as you can augment the SWCG safely and easily.

Enjoy your pool! We are here to offer our best advice, but you gotta do all the heavy lifting!