If your Profile is correct and you are @ level 6.....
Here is what I did at your level and it worked 3 skills and I'm sitting at 10K in gold
Level 7 Ship & Cannon (max since I have the Basic account).
I found a sea (not sure what elements caused this ship to appear over and over since I have seen the same thing but with a Sloop which are harder to track down in a Light Sloop) where the Navy Bulwark flagship appears just off Devils Anvil (DA). The Galleon is level 5 to 8 each time.
Park your ship just off the coast of DA with your gun facing towards Kingshead and where you can see the "opening" in the wall in DA. The Bulwark will respawn near there. Just keep adjusting each time. I use the cannon as much as possible then switch to Sailing to finish it off if I have too. Then board and there could be 3 crewmen in the 6 to 2 level range. Usually only one since everyone will flock there and shoot like crazy.
I worked Sailing & Cannons real hard there and got the additional Cutlass points from the boarding...not alot but it helps plus you will get a full cargo hold each time. Sail back to DA to cash in then do it again.
Just some numbers that I remember....
Max loot / plunder - 220 gold (got this more than once)
Usually about 70 gold.
Cannon - 30 to 50 points if I took her down without the board sides.
Sailing - around 30 points if I board sided her to death.
Took down 10 in just over an hour.
If you do it right you never need to repair with the galleons... the sloops are harder and take longer to take down and board plus the added time to repair...often.