So let's say you want a bunch of mounted archers, but everyone needs 20 (or less) exp. Get the cavalry exp up item and equip it to one of your future archer riders. Then switch their unit to mounted archer. Then remove the item and you have a premature mounted archer! Repeat with all other necessary officers.
Note:you can do this with any unit type if you have the item.
I think A good stratigy to win a battle easaly is to do the following. Get two teams to were your attacking and some convys with the special ability spy. By doing that you will have some buildings to start off for your units moral.Get at least 2 builders as well and some strong units. And get 3 archer units (or more if you wish.) Its a good Idea to have calvery archers and normal cavelry. In Battle: Get your builders to build fences around your base and King. Get some archers in the base aswell (2 or 3) then get your cavelry archers and cavelry to make what formation you want. Let the enemy get about 1 square away then you attack. ( Make Sure to surround your enemy so your tactics will get a combo) Then, if you are felling lucky go straight for the enemy leader.