questions about downloading mods

[Civ Person]

i have a few question a bout mods. im new to dl mods.
1. can you load 2 mods at once like dale combat mod and revoltion mod(in game, after i have downloaded it from site)
2. i can i download for example a mod that has combat mod in it even though i have already dl the combat mod previously separtly
3. do i delete prevouis mods for more improved ones like ffh 2 into a more updated ffh 2

i may have more questions later
i could really use the help so i dont mess up my computer
ps. sorry about spelling

 

[Dale]

1. Look at the combo mods, for instance: RevolutionDCM.
2. Yes.
3. Yes.