device creating help

[Dannyg333]

ive looked thru some of the tutorials and couldnt find one on device making so i was wondering if there is a tutorial for it or if someone can explain it to me i am trying to make a drawbridge that is set up in the beginning and when the switch is pressed it will lower and stay down for a certian time period then it will raise back up thanx if anyone can find anything dannyg333