Nature centers often mark their trails to help hikers get around. You can do the same thing on your woodlot. Blazes give your trails a professional look and aid your travel around your land.
This slideshow with diagrams and pictures shows you different ways to blaze your trails, such as with paint and signs.
This brief write-up with pictures explains the basics of cairns, piles of onsite stones used to indicate a trail.
This commercial website for sign company Voss Signs is one source for standard plastic trail blazes.
Once you have your trail marking supplies, this 6-page guide explains how to mark trails in the field. It’s focused on paint, but the guidance also works if you’re using plastic markers.