DO YOUR HOMEWORK !!! I can't stress that enough, I didn't and it lead to a lot of issues down the road. As Chris said make a plan, it's not set in stone so you can make changes as you go. With a plan you can look at what others have done and how they accomplished things and maybe things you would do differently. read up on other guys projects and look at there pictures (the Gallery is a great place to start). Once you have an idea of your final project take it in bite size pieces, the chassis in your case will be the most involved. Break it down to projects, rear suspension, front suspension, brakes, steering, fuel tank etc.. Take steps to finish things before moving to another, if you bounce around you can lose focus and sidetracked.... I didn't follow any of these steps and have ended up missing out on being able to enjoy having the truck, now it's finally coming together after 30 years..
