I think if you are losing to the easy ai, you lake the mental facilities to ever be good at this game. Use common sense, build multiple colonizers to start the game (2-3). Use corvettes to kill siege, lrm, cap the planet, build turrets to kill the rest while you are working on the next planets.
Also don't waste money early on building cobalts for expansion purposes. This is wrong. Since you really only need to kill siege and lrm before capping planets, corvettes are much more efficient on a cost basis.
Also since some idiot said that the Kol was the "3rd most useful starting cap" I wanted to make sure I gave you the real list before you let crappy players pollute your newb brain. The Kol is tied for the least useful capital ship starting as TEC, and one of the worst in the game as well. It might be decent if you have a little bit of skill and experience, but never as a starting capital ship and never for newbs. I have to stress this over and over again with baddies, just because it says 'battleship", it is not the best capital ship for killing enemies. That would be the marza.
1. Akkan - colonize, ion bolt is great for FFing caps, TU good for outranging immobile starbases with ogrovs. Armistice nice and makes your capital ship invulnerable if you are not retarded.
2. Marza - rad bomb good for targeting low health sbs, raze planet useful for adding siege power, IS ok but not my favorite, and MB is fantastic.
3. Corsev - disclaimer: need to be pretty skilled to use effectively, but can counter corvette spam (if i remember correctly, i never build these)
4. Sova - embargo is great against braindead players and all levels of AI, missile platforms provide free dps, and rapid manufacturing is awesome for pumping out a just-in-time fleet.
T5. Kol - only good for late game counter to mass strikecraft. need more than one kol to enhance the flak burst ability. by itself early game, you are doing it wrong.
T5. Dunov - i mean.... can be useful, but mostly for supporting other capital ships so it really isn't a good starter choice