Plant two columns of Sunflowers while planting Potato Mines to kill the zombies at the start of the level. If the Potato Mines are still recharging, use a Squash to deal with next zombie. Then, start planting columns of offensive plants that will hit the zombies constantly.
After, plant two rows of Wall-nuts (or Tall-nuts if you chose that plant) to defend yourself from Pogo Zombies, Football Zombies, and surprise attack zombies
Use instant kills to kill big groups of zombies or ladders when placed on your Wall-nuts or Tall-nuts.
As you have just received the Coffee Bean, you should use Magnet-shrooms to take away football helmets, ladders, and pogo sticks, making those zombies lose their special abilities. If you do not want to spend so much sun, use a Cherry Bomb, as they kill zombies within a 3x3 area. if you selected the Jalapeno, you can get rid of a lane of powerful zombies without much trouble.
First, plant the two columns of Sunflowers. I'd recommend using the rake, but that's up to you. You should soon get 100 sun and be able to buy a Cabbage-Pult. Start building a barrier on the 6th column. You should build the barrier out of Gloom-Shrooms and Pumpkins. While that's under construction, build 2 columns of Cabbage-Pults, and on the 5th column, place the Magnet-Shrooms. The zombies can't pass the barrier that you've built. Congratulations, you've beaten the level!