web page hosting in the shared environment is great for people just starting up. But chances are, it won’t cut it anymore after you have actually gathered a few hundred clients and have actually upgraded to the highest package that your own provider has.
That is the time to start looking for your own dedicated server to move your clients into. The criteria of the features to look out for here are just about the same as web page hosting. But support should be your main concern at this point. Because in most web page web hosting companies, the provider is the one taking care of support, but if you move out, that burden will have to be handled by you. So, make sure that you have a team ready to do that job. There are often outsourcing companies that will do this for a rather cheap monthly fee. Just look out for fraudsters and you will most likely be fine.