Recap, i usually recommend taking a Spit16 for divebomb practice. For two reasons actually

.
It climbs to drop alt quick.
It will teach you speed management on dive (otherwise you loose your wings).
If you want to avoid the climb to alt, check out the bombing/dive bombing section in the TA. The lead computed bombsight can give you an idea how to aim/where the bombs go.
Tips for divebombing:
Get to at least 5K alt (over target).
Make the dive steep - around 70 degrees. The steeper, the easier to aim.
*Never* use rudder to correct your aim for bombs/rockets. Those will follow your actual FLIGHT PATH - rudder makes your plane yaw and change its longitudinal axis, but not its flight path (sideslip).
Unload Gs before dropping. I found that when making the dive around 0 G when dropping, the bombs more or less fall to where the gunsight pipper points to.