What type of bike? How serious of a rider are you? I have been on/off mountain biking for about 3-4 years. It is a task, building a bike that is. I think the main thing that will be of your concern is the tools. You can knock off most of the bike with basic household tools, but there is always a few things that you need specially made bike tools for. Websites are endless. I have always been a big fan of pricepoint.com for basic stuff, but I doubt that would serve all your needs...Give some info. Are you building mountain or BMX? Are you planning on buying everything new, used, or are using some parts you have already. Look around, there are always things on online retailers like packages, called "build kits" that include brakes, cables, deraileurs (sp?), cranks, pedals, rims/wheels, and so on...Plan on spending money, is all I can say, if you want a custom bike that are you serious about.