Reseller hosting, as the name suggests, is simply you having to sell again what parent web hosting sites for profit. What you do is that you sign up for a reseller plan from any web hosting site that offers this kind of service and theyll give you all the necessary tools to get started. Basically youll be given the stuff you need to open up a website where you can sell hosting space for yourself.
One of the important things that you need to remember in reseller hosting is buying in bulk. This is when you buy the hosting space you plan to sell in large quantities at one time in order for you to get a cheaper price from the web hosting site. If you look at the reseller hosting plan, the bigger the package you get, the bigger bulk you purchase. Needless to say, youll save more money in the long run if you purchase more hosting space in one place, but youll need more capital for that.