I would like to know if i can upgrade my ship from light friget to something else.
Is there a level i have to be in order to do this?

No there is no level. It how many decks that is on your ship


Ship Classifications
Size Class
20 - 49 Scout
50 - 99 Light Frigate
100 - 149 Frigate
150 - 199 Heavy Frigate
200 - 249 Light Cruiser
250 - 299 Cruiser
300 - 349 Heavy Cruiser
350 - 399 Light Battleship
400 - 449 Battleship
450 - 499 Heavy Battleship
500 - 549 Light Dreadnought
550 - 599 Dreadnought
600 - 699 Heavy Dreadnought
700 - 799 Titan
800 - 899 Heavy Titan
900 - 1,049 Massive Titan
1,050 - 1,199 Goliath
1,200 - 1,349 Heavy Goliath
1,350 - 1,499 Massive Goliath
1,500 - 1,649 Leviathan
1,650 - 1,849 Heavy Leviathan
1,850 - 2,049 Massive Leviathan
2,050 - 2,299 Star Destroyer
2,300 - 2,599 Heavy Star Destroyer
2,600 - 2,899 Massive Star Destroyer
2,900 - 3,199 Collossal Star Destroyer
3,200 - 3,599 Galaxy Destroyer
3,600 - 3,999 Heavy Galaxy Destroyer
4,000 - 4,399 Massive Galaxy Destroyer
4,400 + Collossal Galaxy Destroyer

So once i get past 99 decks my ship will change from Light Frigate to Frigate and so on and the more decks I have the better my ship becomes.

yes, it will grow larger. better, well... thats debateable. if youre going for an all deck strategy then its already too late to have an unstoppable scout with the new update, but for now, you just need to know when to quit with the decks, and start with engineers and tac officers. In my opinion, rank 225-250 is when you should start adding the engineers/tac officers. the key is large artifact production. that will allow you to use rank points as you see fit, and still gain decks at a steady rate.

Personally, at rank 247 i use my leveling points for decks, and then 2/3 ranks from rescued prisoners for engineers, 1/3 for tac officers. Soon however, this will change to all engineers and tac officers, as i am way behind on leveling.

Well Im only a lowly lvl 16 so i got a long way to go.