depends on where your base is gonna be, on the hours you're are gonna fly, your sales, etc...
i can tell you that the salary can go from €600 to €1800 a month. it's never the same.
if they like you, you're a good salesman, and you have a spotless record (no "no shows", no "lates shows", etc...) you'll probably make around €1200 to €1300 every month working average of 12 days a month.
good luck