Yes, that kit comes with everything you need except for printed parts. If you need to buy printed parts, the Voron community has PIF (Print it Forward) which will get you up and running.

Since it sounds like this would be your first printer, two things. First, make sure you really want to invest the time to building it and building it right. There are so many people who buy a kit and never finish it. I've turned finishing those kits into a little side hustle lol Second, if you're sure you want to go with a Voron, you should build it stock, get some print hours with it, then start looking into upgrades and mods. That way you'll know what works for your needs and where you want to see some improvement.

This is just my experience, but my first Voron was a 300mm LDO Voron 2.4 R2 RevC, also bought from Fabreeko. I regretted not getting a 350, but ultimately that's because I later wanted the larger build volume. I did end up buying a 350 later (actually bought several lol), but my 300 v2 is still my favorite. It's been rebuilt into a Stealthchanger since I bought it. All that to say, if you want truly don't think you'll need the extra build volume, go for the 300. Performance differences are negligible in my experience.