A company is going to hire me to call up all of their clients and sell them Adwords services (like setting up new campaigns and maintaining them). After the client agrees I'm also the one who is going to pursue the work. But the problem is that I only get paid when a client purchases these services. So all the time that I need to prepare the proposal for this client, the phonecall etc. is not going to bring me any money.
What should be a reasonable percentage on each "sale" that I should get when I take this "job"?
UPDATE (via answer below): I think you both misunderstood me. I'm getting paid for setting those campaigns up and maintaining them and get a commission for doing that. If a campaign is successful or not has nothing to do with it
Thank you for your input, Dennis