If you eventually decide to purchase a domain name of your own you will need to find the right place to purchase it from. There are loads of domain name suppliers as you will see online, it can be confusing where to buy, especially if it is your firsts time.
I can certainly recommend namecheap.com where domain names can be bought for as little as $3.98 (£3) per year.
Get as much literature as you can and read up as much as possible on your subject. You will pick up lots of hints and tips along the way and every little bit will help you to grow your knowledge from the many experts who are very well experienced in the practice and teaching of internet marketing.