Which package is more benefit I should buy (castle lv22, heroes still weak/not max) any suggest?

In the first part of the game, the most important thing is to complete as soon as possible the research "Zone Communications". So focus on Courage Medals.

Other than that, the most useful thing in the game is the VIP shop (it's a bit expensive, but it's a one time expense) That will provide you almost all the super tickets you'll need.