I've done C-41 off and on for at least 38 years. I've used it to develop the CN-2 movie films, too. It's easier than you think, despite the alleged +/- 1/4 degree F developer requirement. That's ideal, but not essential. After all, how many here have a thermometer that reads to that level of accuracy? Even my Kodak lab grade stick thermometer reads only to one degree. The good news is that the popular kits have a lower temperature option which makes temperature control much easier.
Ask yourself, "What is my intended purpose after development?" If you send your negs to a lab to print, it will probably cost you more than just sending your exposed roll in! The most logical option is scanning them. Oh, the analog purist screams of horror! A dozen years ago the concept here (when this was APUG.....Analog Photographer's User Group...was pitchforks and burning at the stake. APUG transmogrified to the inevitable and now it's Photrio with a Hybrid forum, and a digital one. Scanning and inkjet printing lets millions of people make images that they could not due to lack of a wet darkroom. You can also provide a scanned image to a lab and have a "real" RA-4 wet print made.
Color neg films also make incredible B&W images! No need for Ilford XP.
Moving on, to get your feet wet, just go with Unicolor.
https://www.freestylephoto.biz/search?q=unicolor Forget Flexicolor; it's a very complicated system and you won't get any better results using your home darkroom.
There's nothing wrong with blix for home use. I've been on threads here years ago on blix vs. separate chemicals and even the much revered (RIP) Photo Engineer held out on separate as best, mostly theoretical, but blix ain't bad.
After you use a Unicolor 1 liter kit, you may want to try the all liquid Rollei/Compard chemicals. This is what I've last used.
https://www.adorama.com/l/?searchinfo=rollei c-41&sel=Item-Condition_New-Items
You can make as little or as much chemical as you want, since it's liquid, and although they don't give directions, the bleach and fixer are separate, so have at it. After you open the developer bottles, blast some canned "air" (a Freon) in to displace the air now within.
A trick to fight the short life of any C-41 developer is to 1) blast "air" in as above, 2) refrigerate, or 3) freeze.
I hope this helps your journey!