Installing the coin script first is always a good idea If you would like some help installing the coin and bank script (what I prefer) please let me know. I can help with this tomorrow
This is the default amount of missions that are to spawn. I do not believe that there are any config options for this in 2.1.4 but there are in 2.2.0. If running 2.2.0 there will be an option that says something like MaxHeroMissions and MaxBanditMissions. You can adjust those numbers to whatever you like