Go for around $5 CPM.... aim for good chance to excellent.... anything less won't do.

10 sites is too low... aim for 200 or more... I have some campaign with over 500 sites.

Track the CPM and clicks... I usually watch it till it hits 100 impressions.... if there is no click, i will fire the site....

I aim for anything below 20cents max per click per 100 impressions... but it depends on you profit margin and stuff like that.