ill get u some links here shortly
1st Unpack [UNpbo] your evolution.sara map. [make sure to make a backup copy]
go into your Arma profiles folder, and create a folder called your namechoice.Sara inside "missions"
place the "mission.sqm" file u unpacked from evolution.sara and place it in that folder.
now start arma, and go to the editor[using the profile name u saved the .sqm under] load sahrani and then load "namechoice.Sara" u are now looking at your evolution map. i think the players in evo are named "AP" but when u find the spawn zone u can just change any of the units or vehicles u like. add/remove, replace, etc. make sure u name it its original name though[player [ap]] and place the unit inside the blue box.
cool tips
now that uve unpacked your evo map [using ARMA edit] u can download addons, unpack them, and figure out the new downloaded units class names. in the evo folder find "scripts"folder and open up "recruit.sqf" u can change the kind of soldiers you recruit also[using their classnames]
ok so now that uve changed the sides in the editor, change the intel name to fit so u know and save it as a new name. now u close arma, and go into Arma profiles open your name go to missions folder and copy the new "mission.sqm" paste that into the unpacked evo folder replacing the old one and pack it back up[PBOView or UnPBO] the tools are easy to use here are some links to d/l them