Ships Ships Ships! What's a noob to do ?

Rejnforcement is just backup. You have 1 capital ship and 5 ships on your side at the biginning, and one ship for reinforcement. That ship is for when one of your first 5 ships die, you call in the reinforcement when your capital ship's turn comes. Calling reinforcement is one ability of capital ships. Or you can just use other ability and not call reinforcement on that turn.
for 1~2 star capital ships you have 1 reinforcement slot available.
for 3~4 star capital ship: 2 reinforcement
for 5~6 star: 3
for 7 star: 4

FOTP Vader Vader ship and a lot more can be farmed F2P through Fleet Arena Shop. You will love it.

Silencer looks good, never met one, but he doesn't have an ability to inflict target lock, so I think he is just a nice addition, rather than an insanely crucial, must-have ship