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Jimmie,
Two colors are fine for now. Actually Harold Speed recommends two colors at the beginning. I think his was white and black or raw umber, I am not sure. Just get that paint moving around and make sure your underdrawing is as accurate as possible.
There is a little cheap devise that I use. It is called a C-Thru ruler made by the C-thru ruler company. It is a transparent plastic ruler 2" wide and 12" long. It has red markings every 1/8 of an inch. Hold it up to the subject at the same plane as the drawing or painting if you are doing relative size, ie. the painting is not directly next to the subject as in sight size. Always look at the subject from exactly the same point of view. The measurements can be quite accurate this way. Remember the eyes at the inside corner are always in the middle of the head and keep dropping those vertical lines for accuracy. A plumb line is a big help for that. I use a lead fishing weight at the end of a string. You can probably find a plumb line as well.
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