Purchase miniatures only when you are willing to take the up the cost on yourself and you wish to maintain them. Be prepared for miniatures that are packaged and numerous pieces. It is very common in the industry. A good model glue, cyanocyclide base usually works. If you wish to paint the miniatures research your options first.
People use different types of paints and for different reasons.
One constant is always buy a primer for the miniatures. It will increase the lifetime of the miniatures. Consider in investing in a solid case lined with foam padding to house your miniatures. With it they can be carried from place to place easier and without damaging them. It also is a handy storage facility.