first of all try to read my tutorail about platform animations. http://www.scirra.com/tutorials/351/platform-behaviors-animation
2nd thing if you wanna the bomb to go to the ground try to use physics it will give them nice effect as i said... also you can use platform as Rory said.
last thing the spawn from stomach this because you have to change the point to fix that do these stuffs :
1- go to your player and click edit animation > create new point and put them on in the place where it should spawn
2- in eventsheet > in the event of spawn > put the number of the piont that you created .