What is the proper way to install a router bit into the collet?

Insert the router bit in all the way until it bottoms out then backing off 1/16″. This will allow enough room for shank expansion and keep the router bit from freezing in the collet.

What is the leading cause of dulling cutting tools?

Excessive heat is the leading cause of cutting edge deterioration. This can occur from cutting very abrasive materials such as MDF, melamine, plywood, etc. In addition, cutting tools become overheated and dull from improper and infrequent sharpenings, incorrect feed-rates and RPM, excessive removal of material, inappropriate cutting tool selection for the type of material and machine, and inadequate horsepower.

When should I use a single flute, two-flute and three-flute bit?

Single flute bits are primarily used for cutting to size when speed is more important than finish. Two and three flute bits are used when finish is more important then speed. The more flutes you use the slower the feed rate.