I think you will find win98 is a bit too old to be relevant. Most people will want XP/2000. Also how much do you know about networking & tcp/ip? Also web technologies would be good.
Chech out somewhere like
qa training but be prepared to be frightened by the costs.
You are also going to be competing against a lot of people who used to do this for large companies until they were made redundant.
I am not trying to be negative but I work in computing and know how bad it is at the moment.