Trigger Requests!!

[emjlr3]

I am a little stuck, I need some triggers like what are in Dota, I need one that creates a random item at a spot after so long into the game, then once someone picks it up, it waits a certain amount of time then reswpawns a random item at the same spot

I also need one like that but for creeps, where it spawns the creeps at a spot, then once they are killed, it waits so long, then respawns a random creep group again at the same spot

lastly I need a leaderboard exactly like what is in dota, and the triggers to count player kills, elapsed time and such

ty for any and all help it is greatly appreciated!!