This guide contains a lot of advices to manage your success, advices will be in red !

If the opponents are weakened by your harass, and if you want to tower dive, go in the grass. Then Zilean put a Time Bomb on Talon, Time Warp and during the tower diving he must try to put another Time Bomb in the enemy team.
And Talon wait Zilean boost, next he use his Ghost, cutthroat the target ( the ad carry would be best ), Rake, Noxian Diplomacy and Shadow Assault. If the opponents survive, put your Ignite on him. If the opponents team have too many heal, put your Ignite first to reduce their heal half.

Don't forget that Zilean is a support, so don't push with him.

Don't push with Talon too, because, if you want to kill the ad carry after push, you must tower dive ! But don't forget to take the last hit :P !