Theres various ways of getting points, and ALOT of things you do that don't give you points. If you're looking for top score there are various things you can do but i'll simplify it.
1) Take damage (Tank, Parry hits, Shield)
2) Support (offensive support, healing, module damage)
3) Kill people (revenge, saviour, payback, etc, damage)
4) Objectives (command ship, fighters, assault ships, capturing zones, territory)
Seeing as your a recruit match, chances are you'll solidifying kills and executing well (which is definitely a position in Dreadnought), but you're skipping out on either supporting team/tanking for your team. Another note is the more you excell at each section - the higher point rewards you can get. So you can get things like:
Combat assistance (contribute 10% of total damage to 10 player kills) and thats like 250 points.
Invulnerable (Block 3 incoming attacks, each of which would have inflicted 7500 damage or more, by activating shields within 2 seconds of each impact)
Justice (avenge 3 teammates within 15 seconds of their deaths)
Smooth sailing (take a massive amount of damage without dying)
and the list goes on in your ribbons. but yea! just keep making an impact in games and you'll get more credits...though some ships are easier than others.
"A good soldier obeys without question. A good officer commands without doubt."