Where to get images?

Im trying to figure out where to find images I can add to my blog for free?

Google “free stock images”

Also, do all free themes have to be customized as far as colors, font, etc…or are they already set up that way?

The vast majority of free themes come ready to play with right out of the box. 🙂
Many of them have demo pages.
Once a theme is installed and activated, in your Dashboard, go to Appearance > Customize and there will be parameters of your theme you can change such as colors, sections, layout, etc.

And as you are new to WordPress, I’d advise looking this over: WordPress Codex: What You Most Need to Know About WordPress & Learn How to Use WordPress

I suggest https://freerangestock.com for free images. Most of unsplash is there, plus a bunch of other sites, plus a ton of photos you can’t find on other sites.