[i am full of questions...sorry] Check points and similar

[Danny Boy]

Hi there i am have a question... how do i make Check points? and also how do i make a action like for example a monster to spawn again even if i die? because normaly if i die the monster does not show up again :/

oh and one more thing... if i make a level door and go to the 2end level and go back for the first... how do i instead of starting in the bed (like in the begining of the game) start right next to the door?

thank you...