Looking for the best advice

I am planning on starting a carpet cleaning biz. My plans are to start out slowwww... and on a part-time basis. I have been considering all methods but have been leaning towards the rotovac method. But, to tell you the truth, the more I read about all of the different methods being used the more confused I get. Everyone claims there method is the best of course. And then, I am concerned about some of the things I have read about the rotovac putting down too much water and not working well on surfaces that are not perfectly level..etc.. So before I go out and purchase equipment, I am looking for the safest and most preferable method to use. Also, what about training. Can I just buy the equipment and then start carpet cleaning? Since I have never done it before, whats the best way to get started, limiting the possibility of messing someones carpet up because I have no experience? Does anyone recommend the dry method such as HOST? I know that where I live, in Raleigh NC, one of the most successful carpet cleaning companies in the area use the Host system exclusively. The dry cleaning approach is very attractive because of the no dry time factor.  Maybe its best to offer more than one method and let the customer choose? I would really like to know if anyone else experienced the same decision making dilemmas as I am facing. I would appreciate any and all opinions... Thanks!