Some facts and advice.
1 - 3-8 clicks and 6.000/7.000 impressions = 30Euro/month.
2 - In every page you can put MAX 3 banners.
3 - The payment is when you reach 70 Euro. (you can increse this value, 70 is minimum)
4 - The money are sent to your bank, you can use prepaid card.
5 - You CAN'T, you CAN'T click on your banners. If you click also two time they will block your account. If you click by mistake, contact support.
I hope it helped u.