No problem, you English is pretty good.

I don't think you can change the SPQR missions (they're hardcoded), but you can alter starting alliances and wars with this file:

C:/Program Files/Activision/Rome: Total War/Data/Maps/Imperial Campaign/Descr_strat.txt

It's near the top. With this, you will see a place to edit beginning wars and alliances. I'd go more in depth but this computer doesn't have Rome: Total War on it.