Stealth quite desirable. Low cost vs likelihood of loss required. This is done in the enemys interior, flitting from location to location, driving at warp nine when a threat appears. Scanning is quite useful if you can swing it, or pair up with a good scout. Forward belt mining.
Speed is good thing here, as is a bit of stealth.
From a forward base, drive at warp nine a full eighty-one light years, lay a field, and pull back. Or if you are good, lay the field 81LY from a system where you are not, and do some decoy work. The basic Mine Dispenser 100. This is what everybody gets, unless you are a Space Demolition race. If you are playing one of those, extend this analysis for the other dispensers.