Here are a few quick videos that detail the steps to building a belay that can be suited to your situation. These cover 3 types of belays, in reach anchors with the rope, out of reach anchors with a rope and a sling anchor.
This first video takes a look at the different ways of tying the all important clove hitch, required for belay building.
Video no. 2 takes a look at out of reach anchors. A good type of belay to learn to build when starting out. Initially make sure you can perfect one type of belay before learning all the variations.
Video 3 looks at in reach anchors.
Video 4 is anchors built with a sling.
We hope these were useful, dont hesitate to ask any technical questions you are unsure about.