Most of what is needed is at the bottom third and can be accomplished by the average tools - hardware and software. The middle third may require some specific expenditures, but for less of the needs than the bottom third. The top third is small, and may not be required by most clients. Determine if you need special software to accommodate them - you may not. I suggest you find one or more association, group or other source to help with the needs as they might arise.
Some sources are maillists, newsgroups, user groups and associations.
One caution - plan on contributing as well as taking information. Pass - Unfortunately, there are times you should decline to market a homepage. Questions of ethics, morals, or proper use may arise. Rather than risk being associated with the wrong type of client, for your own image, you should just pass.