I'm not sure I'd do very good as a co-GM, but I'll accept it if you think I'm good for it. Everyone RP I've GMed never really ever got off their feet, so if you're willing to risk bad luck, go ahead.

As for 1000 soldiers- that might actually be too little.
1) You'll need sizeable forces to send at an enemy. If I have a fleet of 20 ships, that may be enough to have at least one or two guns for every one of your fighter things. 
2) Only the most foolish would launch most everything in their attacks. If you use purely fighters, it's more likely that you'd keep at least half around you for protection. They can be replaced, but the Queen cannot, correct?

I'd like to request that the Hocklyn Slaver Empire is new to the Stellar Dominion- didn't participate in the First War. That way, no one- likely not even the Stellar Dominion- would know the location of their homeworld or even very many of their planets. This way, just bombarding the surface won't be an option- anyone who has a military mind and wants to free and conquer the Slaver Empire will want information, which can be found by infiltration of ground facilities. For the sake of epic drama, I would also say that the data is in the form of a highly encrypted data device that would have to be manually retrieved, not just transmitted or anything. 

Being new to the intergalactic scene would both be cause for other nations' wariness, and perhaps reluctance to attack a new, unknown civilization, and care, since if they end up winning and digging into Dominion Space, they may just knock out the few worlds that might have information about the Hocklyns' whereabouts, and they may come back to bite you in the ass because you had to spend years searching for them, while they knew where you were all along.