How should I do push up to get better chest?
I tried some and don't quite effective to the chest, the force are on my hands.
That's the beauty of push up, we can train various muscles from push ups. I found this video about Chest Workout: Pushups for the Complete Beginner interesting.
How should I do it to focus on the chest?
I would suggest Wide Push ups to focus on our chest.
I took this pic from YAYOG book page 60.