Your Captain is a key component to your fine vessel. A properly leveled Captain will help turn the tide for you in battle... and every ship can play it's role better when tuned properly to both your own play style as well as compliment the ships standard abilities. This link provided is a free site that allows you to play around with your skills without having to re-train your Captain. Remember... once you have trained him/her, you can not retrain them without spending dabloons. You may also want to consider using a single commander for each ship class for every nation. (For example, if you are running Japanese Cruisers you may wish to move that commander from Teir II, to III, to IV etc all the way up the line. This will allow you to have a higher ranked Captain for your higher tier Cruiser that has been trained to play in the Cruiser line.)
shipcomrade.com/captcalc
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"Revenge is a dish best served cold" - Klingon Proverb