I'd probably recommend purchasing one of these if you don't have any tools to build one. http://www.cserpents.com/C_Serpents/RACK_SYSTEMS.html

By the time you buy all the tools and hardware necessary to build a rack, you'll have already surpassed the price of one of these. I've heard nothing but good things about this company as well. Although, if you're planning on continually building racks because you will be growing your collection, then buying power tools would be worth the investment. If you'd like to know what tools I use, pm me and I'll give you a list.