Don,
Choice of blade size is not always simple, but the usual rule of thumb is "the thinner the wood, the finer the blades teeth should be." It's not a universal rule that works for everything, but it usually is a good starting point. Teeth that are too fine will overheat and that is certainly to be avoided.
If you have any number of blades, make some test cuts with each blade in various kinds/thicknesses of wood and keep a chart for what does, or does not, work well. If your saw has variable speed setting, try each blade/wood combination at two or three different speeds as well.
The width of the blade (1/4" in your case) affects how easy (or difficult) it will be to make straight cuts, or curves. Narrower blades cut sharper curves than wider blades. Wider blades generally cut straight lines more easily than narrower blades. I have a couple articles that may help you, but they are too large to attach nere. I will email them too you.
Best of luck to you.
Steven