The one thing I would be very careful of is the fact that many people will want "minor" problems and fixes dealt with FOC. By this I mean that you are always getting phone calls "How do I...." etc and this ends up as a large amount of wasted time. The tendancy is to do this at the beginning as you want to build up good will and support from your customers, however, in time the amount of time spent in this way means that you cannot concentrate on doing what you set up to do - make money. Be hard nosed and charge from the beginning - even if a little as it will put off anyone who is just too plain lazy to read the manual or find out for themselves. If it is a genuine hardware error then fine, but most of the time it is something that the like of PC world would charge £50 or so to fix!