Hey Luv, First off there is a lot of information and answers to your questions already here in NamePros just become a student of the game and start reading a lot. If you are having good results in eBay then I suggest you continue to duplicate what you have done.
As far as investing in the right domain names you have to focus on domains that have value and can be beneficial to a lot of other people. What I mean by this is simply one important criteria, how many other related websites are using the domain keyword you are looking at. The way to do this is by taking advantage of tools like Zfbot.com here you can put the domain you are looking to buy and see how many other related websites are there. The more sites there are the better since this means other people find the domain name valuable and your domain could possibly be a better version of the name they already own.
Having a lot of monthly searches is valuable but it is not the priority. My focus is mainly 2 word .coms and 1 word .org, .net .info and even some .tv. Before you start buying anything else though learn more by reading and find your own style. Some people focus on short character .coms and numeric.com domains. There is no specific way to do this business but do not reinvent the wheel and learn from other people who are currently doing it and finding success then follow their footsteps, learn from their mistakes and this way you avoid making the same ones.
- Will
