Unit order trigger (Please Help ~Thanks)

I am going to try an explain this but its sort of complicated, so bear with me.

Every 30 seconds, units (equal to player 1) in region x are spawned in region y. When a unit enters region y (equal to player 1) they are ordered to attack-move a certain region by default. ~ this is already made.

What I want is to have 30 seconds be rounds. Every 90 seconds (3 rounds) The game will ask player 2, to select (click) a stronghold for the units who spawn in region y to attack-move. Based on what stronghold that is selected, the region that the stronghold is in, the units will then attack-move every round from now on. This will happen every 90 seconds (3 rounds) and if no stronghold is selected, units will just attack-move the previously assigned location.

What I need help on is creating the above trigger, and also have a counter that says what round it is and how long until the next round.

This is a pretty complicated trigger, but if anyone can even leave simple feedback or basic code that I can work from I would really appreciate it.

This trigger is for the changing of rounds
E:
Every 30 seconds
C:
(none)
A:
set rounds = (rounds + 1)
set the title of leaderboard to ("the title of the leaderboard: Round " + Integer2String(rounds))
(add more actions)


Rounds is an integer variable
Leaderboard is your Kills/Rounds Counter (if you have one)

This is the trigger that turns on the selection trigger below it and tells the player to do something
E:
Every 90 seconds
C:
(whatever player) is playing equal to true
A:
Display text to Playergroup(whatever player): "Please pick the fort to be attacked"(or whatever)
Turn Selection Trigger (for whatever player) on

FortToAttack is a Unit Array.

This is the selection trigger (this should be off at first):
E:
Player whatever selects a unit
C:
Unit type of Selected unit equal to Fort
A:
set FortToAttack[player number of whatever player] = Selected Unit


When the units spawn, have them attack FortToAttack[player number of whoever] or if they aren't attacking the fort itself, but attacking to where it is, then do attack move to (position of FortToAttack[Player Number of Whoever]

For the Round Timer, you could just make a timer and give it a window.

Do you think you could go into more detail on how the leaderboard creation works?

I want to have like three sub-titles. (like team 1, team 2, team 3 ect. Under each time will list the players in that team) I also want it to display kills that are only from players killing players, but not really sure how to do that.


Also for:

Is that even possible, I couldn't find anything that deals with selected units under the "unit-type comparison" condition. Could you please explain how I would do this?

Thanks!