Here are detailed plans on building a Dobsonian Reflector . Compound telescopes use both a lens and mirrors to make the image, the eyepiece is usually at the back. Compound telescopes are usually very short in relation to their diameter. A compound telescope is a reflector with a lens in front that makes the stars at the edge of the field of view appear very crisp and sharp. Each type of telescope has its advantages.
Reflectors are much easier to make and can be made very, very large.
Compound telescopes fall in the middle, between refractors and reflectors. The larger the diameter of lens or mirror, the more light the telescope can pass through the eyepiece. Finding objects in the night sky takes some practice. At the same time it helps to use a low power eyepiece in the main scope. After you find the object, then try more power.