Answer:
You can make web site hosting a career if you have the knowledge of computers and the internet. You will also need to have knowledge of IP addresses. You will also need a reliable operating system.
Keeping in mind there is a big difference between Hosting and Website creation. A 'career' in HOSTING . is certainly possible .. there are many companies (etc) who do. In addition to the above, you would probably need a facility to house the computers you would need to process the traffic to and from your client's websites ... and the fast (T1) connection hardware/services to handle the 'load'. Further .. you would probably need a LOT of start up capital to pay for all that .. because it would take some time to get clients to financially support the venture. Further .. the competition is tremendous. There are thousands of Web Hosting services/vendors/providers.