As a beginning gunsmith, which decisions would you make regarding the purchase of polishing equipment?

Research: Come up with a realistic quote of purchasing the following equipment: a spindle/grinder polisher, a belt/disc sanding combo, a sandblasting cabinet, and a tumbler. Reflect: As a beginning gunsmith, which decisions would you make regarding the purchase of polishing equipment? How important are these in the trade? Which accessories would you require? minimum of 500 words