Just, where you reruit them normally, also in banks.
That's right. We had to find a way to represent the mercenaries during italian wars and this is the result of it. Glad you like it!
A quite good choice for beginners in TIW
Some hints:
First of all follow the order to conquer Pisa, on your way conquer Volterra as well. Then built a port and secure/conquer the cities of Arezzo and Siena, but be careful with Siena. As you can read in the info event, some cities are harder to conquer than others. To secure the Tuscany, conquer Grosseto as well as Piombino. After that take controll of the Island of Elba and try to conquer Lucca and built a silk factory. In the meantime try to arrange some alliances with venice, pope and milan. So that you can focus on gaining control of the Tuscany. After that, you can invade Corsica for example
One more advice, be sparingly and do not let your armies walk outside the cities if you don't need to, waste of money!
Hope that will help you
Cheers
P.S. There is also a Battle Beta