First of all, you need to lure the clan castle with your barbarian and archer to a corner and kill them with either your clan castle or a few wizards or a Valkyrie, but this all comes down to your preference.
Place your giants in a side ways line, like a row of walls.
Now place your Valkyries behind them and
Right after them, your barbarian king.
Now put in some wall breakers to break the first row of walls.
Now you need to put your wizards in a row.
Finally put the rest of your wall breakers and your clan castle down, if you still have it to use.
Now use a rage to speed them in towards the center.
If a whole group of units are low on health, drop a heal spell.