i have this idea for a map its based on the series percy and the olympians in book 4 they have a battle. Should i make a labyrinth for the enemy to through first and no like early attack barrier thing. or should i make like a little barrier to the entrence and they have to wait a few minutes. or should i jsut hafta let them make their own units... The basic type of game is like helms deep...

I don't think any of us could possibly tell you that. You just have to decide for yourself and what you think is best.

Having said that, if you do wait for it to open, I wouldn't wait long as that could be annoying.

true waiting a long time would be annoying so ill just make like a killable barrier so it will still give the defending forces some time to prepair but it wont be tooo loooonnnnggg

That would probably be the best way of going about it.