It is always question of capability (what it can do) and capacity (how much can it do).

Capabilities

What do our ships do?

What are their roles?

Do we have space fighters and equivalent of carriers?

How many of them do we have and what can they do?

Are we based on energy weapons or projectiles and missiles?

What are the defenses?

What is the range of the weapons?

Size

How big is our space navy?

How do we take care of them?

Can we defend all our planets, or do we need to be selective?

The Mix

What kind of ships do we have?

How are they formed together? Or separately?

What are the formations?

Fleet Laydown

Where our fleets/ships actually are?

Fleet Posture is where we want our fleets to be. Fleet Laydown is where they actually are.