For a newbie game I'd suggest:
4 players in a small galaxy (spiral makes fun games). 3 good starting planets gives everyone a good base to start with and ensures early carnage(err.. diplomacy ).
Check out "New Dawn" in the PBW Open Games directory.
Here's what we can afford:
1) Great Star Trek/Star Wars empires!
2) Custom wonderful map creted only for "New Dawn"!
3) Endless help for newbie players!
There are few slots open so Subscribe now!
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Mr. Uplift Mofo.
A man based on a plan.....a plan based on a man.
Hmm Seems a few people mentioned joining as a replacement so my 2 cents worth is NOT to do this. Joining as a replacement can be fun but I don't think it's a good idea for a newbie. If the game is advanced enough you jump into a micro management hell! Plus it can be difficult to get into the spirit game.
I think it would be far better to start off with your own empire.