Welcome to Stronghold Heaven!
So, if I understood you correctly, you have actually created a skirmish map? These are not actually multiplayer maps, they can be used in both singleplayer and multiplayer. What you would need to do to play this map with AI only would be to go Crusader from the game's main menu, and then pick Custom Game. There you can find your map, and play it in with settings you want.
There you will also find Crusader Trail and Warchest Trail. They are very fun too, and you will find a lot of fun and challenging missions there!
Yes, the objective is to kill the enemy lord, but I am pretty sure you will figure it out.

Regarding adding events, you cannot add them in a skirmish map, only in scenario maps. But let's keep it simple for start.
I'd suggest you to play those simpler missions first, such as those from Campaign, or the first mission of Crusader Trail called Arrival. And just after playing some other scenario maps to try to make some scenario maps by yourself. There are many cool fan-made scenarios you can find here at Stronghold Heaven's downloads section.
Oh, and you asked your question in the right place, as it is related to maps you created. If you have any questions that regard map making, this Stronghold and Crusader: Scenario Design and Modding Forum is the right place. When you have a question about the gameplay, then just you can ask what you want at Crusader, Warchest, & Extreme: General Discussion & Help.
If you have any questions, feel free to ask. 
[This message has been edited by EaglePrince (edited 10-16-2017 @ 07:41 AM).]