Theme Top Menu Bars

I just realized most themes don’t come with an installation guide or website. I want to implement a top menbar in the header with my choice of men items. Yet most themes just use pages as menu itmes and you would have to change the code to accomplish what you want. Now I decide to abandon thoses themes and swtich to menu bar plugin implemented in page templates. I would like to know if this is what most people would do or there are some ways to get some support.

Warren