Look for a base that has a lot of of loot (look for a base with around 150-200k of each resource,not including DE).
Next you need to see the defense, again while you are looking at loot also pay attention to defense. With the troops that i have stated you also need to look for a base with level 3(at most) wizards towers and level 3(at most) mortars.
You will now need to deploy 1 Giant next to a wizard tower or a mortar, followed by 2 wall breakers(if they die remember you have spares) to the direction the giant is heading, then deploy about 10-20 archers near the giant to destroy the Mortar/Wizard Tower.
Your giant would probably be dead by now, so drop ALL OF THE GIANTS now. This will give you the opportunity to destroy some defense.
Never underestimate wizard towers they can be a very easy target or even very strong.(Tip: If you are attacking a wizard tower with archers then remember that you must not deploy them all at once in 1 spot, instead deploy 3 on 1 tile then skip a few tiles and then drop some more archers that way the splash damage won't take all of your troops out at once).
Drop a heal spell as soon as your Giants have low health(under 50%)then wait until you have broken well into defense. drop another one were you think you will need it( usually needed if wizard tower is attacking giants.
Now you should have broken most of the base, drop your barbarian King to distract some more towers(or to destroy a mortar as this should be one of your main priorities.
Now drop goblins near the collectors and storage's this will help you get the loot faster.