I am a noob at this whole map creating thing, but I assure you that once I get started on my project im not just going to abandon it... basically what I want to do it add on to the *cleanup* single player map... Could someone give me a link to a tutorial on how to EDIT an already created map, dont worry, I will give the proper credit to the creators of the map I want to edit... Thank you :)

it is not hard at all. here is a tut link. http://hce.halomaps.org/index.cfm?pg=3&fid=2480.

Thank you, I hope this tutorial helps me... I really appreciate it!

you mean like edit already made maps? you'll need the hek+ for that. its on this site some wear, look around.
And if you want to edit the single player maps, well the only one you can open in sapien is the silent cartographer (b30) and all the other ones you'll have to make a new .scenario file and add the bsps. I've tried it and don't recommend it until your really good with sapien.

Both of you really helped me out, I think I might just start my own map now, my cousin said he is going to help with the whole map making thing and I will be the one to add the tags and stuff, anything that can help me with how to add AIs to the map and stuff?