Just some reminders:
Unless it's one of VERY FEW cases, your motherboard needs to be set OFF the case; use brass standoffs for this (which I believe are usually in the case box. If not, check the mobo packaging). If your mobo is sitting flat against the tower, you will short it and it will be sad days. Those standoffs will keep it raised and electrically isolated.
Your CPU connector should probably be one of the first cables you put in. It's a PITA to reach once you have all your parts on the board. Your top fans, too, probably. Anything in the top region of the board gets obstructed pretty quickly.
Make sure you ground yourself often, either with a strap or by touching something (typically a PSU if plugged in to the wall can be touched (not in any of the electric bits!) and this will do the job. I've never actually had issues with static, but just a reminder.
Use a working system to download all your mobo drivers onto a USB from the mobo website manufacturer. You'll thank me when time comes to install them.
Once you have finished your build and configured your software how you like (but typically pre-game): MAKE A SYSTEM IMAGE AND SAVE IT SOMEWHERE. They aren't huge, but if you have to reset ever, it'll save you a TON of time.
If you're doing games, unless it's on a shared SSD, consider partitioning your hard drive for Steam in particular. This has the advantage that if you have to wipe the OS, you do not have to wipe and redownload all your games; simply open Steam in admin after reset, and verify the game caches on the games. It'll instantly re-validate them; you may have to run the minor first-time setups thereafter.
Write down all your parts and their models/serial numbers while you have all the boxes and stuff out and handy. This will be a useful reference later, particularly if there are any warranty issues.