Hello esbono and welcome to the .org, enjoy your stay.
There are no stupid questions neither you should feel bad for being new to the game; we all were at one point.
Agents in STW gained honor in rising increments, for example valor1 (or honor as it was called in STW) would be reached say with 1kill, valor2 with 2 kills, valor3 with 4 kills etc. This meant that passed some point it was really hard to valor up your agents as too many succesful missions were required.
I have reasons to believe that exactly the same happens in MTW and that there is no "cap" (limit) theoretically as to what valor can be achieved - however there is certainly one practically. Personally i dont remember seeing agents above valor 6 (or 7?).
This guide might also be helpful:
https://forums.totalwar.org/vb/showthread.php?t=54932
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