This is not really a standard fleet, but if you want one that will kick some butt, play as the rebellion. At the start, have every shipyard available build Blockade Runners. These ships have a good balance; They can get both large ships and starfighters, can bombard the ground, and in large numbers, destroy any imp fleet out there. Keep building Corvettes, untill you get up in the 200 range, at that point, it's too big a fleet, and you need to build a second one. These things attack with a little more fire power then star fighters, but get destroyed a lot harder. They can attack TIE's and then destroy the capital ships. If you need to assult a planet, take a troop transport in. As always, keep two interdictors in the fleet.