I'd say 10 is a pretty high expectation just to get things started, you might eventually get a player count that high but by the time you do you will likely have already lost a few of your players who joined early. Really what I would suggest would be about 4-6 players to start out and leaving it open for people to join after it has started (Saying so in the OP), the game's I've run tend to get a lot more interest once they have actually started and people see what is going on and want to be involved.

Since you're a regular, you could also try making a thread to advertise this in spam, might pull in another couple of players from there.