While you're having fun setting up your site, there are some other steps you can start taking. They can be done in any order and with no particular time stress.
1. Get a Password Manager
You are going to have many passwords and many usernames for many sites. A password manager is ESSENTIAL and if you use the same login details for more than one thing you WILL be hacked and all your work will go down the drain.
2. Get a Gmail Account
After you've bought carsforcriminals.com try to get email@example.com or the closest thing you can find - carsforcriminalssupport@gmail or whatever.
3. Sign Up with Google Analytics
4. And Webmaster Tools (Search Console)
5. Start Claiming Social Media Accounts
Depending on your niche and how big you want your site to grow, claim the relevant social media names. Google plus, Youtube, Twitter, Instagram, Pinterest, maybe a Facebook group.
You don't need to do all of them. If your niche is female-oriented then Pinterest is a must. My 'learn English' site does great on Facebook.
But even if you never use these accounts it's better that you set it up if only to stop other people using it.
6. Create a Spreadsheet to Track Income and Expenses
7. Create an Account at a Free Stock Image Site
Your site needs images, and probably lots of them. There are a bunch of free image sites - sign up to one or two. Later you might sign up to a premium image site to get something that looks great - but to start with, free is fine.
Just don't go using images from Getty because they will sue you.
8. Get a Keyword Tracker
Tracking your rankings for keywords is SUPER IMPORTANT.
Rankings fluctuate a lot, especially in the beginning, but you want to know how well you're doing, which pages are struggling, which topics get to the top 10 faster - all that good stuff.
The good tools start at 20 dollars a month, which is too much even for me right now. So I use something called Serposcope. It was very frustrating getting it set up, but it's free and it works just fine.
The main problem with it (apart from its fiddly interface) is that if you do a lot of searches Google will think you are doing something dubious and hit you with captcha after captcha. Serposcope is supposed to be used with Proxies and I've never got my head around that stuff.
I found that by setting the 'pause' to between 20 and 80 there were no problems. (Basically it pauses between searches so the minimum break between searches is 20 seconds - nothing for Google to complain about there). That makes it slow when you're tracking hundreds of keywords, but I run it every 3 days and it can run in the background so no big deal.