This all depends on the CAD software you're using, but in general: you will have symbol libraries and footprint libraries. Welcome to the area of CAD which engenders the most discussion! The approach for showing values on the board is similar. I sometimes add one letter to the value to show what kind of cap it is if the design requires it eg. To show the value in schematic, you just go view -> part marking -> additional marking -> values. You can specify a value by right clicking any component and entering it.
The AP suffix is for axial electrolytics. The different caps have names such as "cap 200 rp" which means 200 mils (0.2 inch) radial polarized(=electrolytic). You should see the patterns for the highlighed item in the left bottom corner. In the "discrete" library, there are a few caps to choose from. Once you know the leg spacing, adding them to the design is a piece of cake. However, you can go very far by having a small assortment of panasonic FM's at home. I have never built anything using DOA's, so i cannot give you any application specific advise. Check the data sheet from the manufacturer. If were talking radial electrolytics, 0.1", 0.2" and 0.3" are by far the most common options. Click to expand.You will probably have to know the leg spacing for capacitors no matter what software you are using.
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