How can I create a scope of work where campaigns are promised but limit the size of the campaign?

I am working with client and creating a scope of work. This will be a 12 month engagement and after the initial 3 campaigns that I have created I plan to include an additional campaign each month. I am new to Infusionsoft and marketing automation. I see how complex a campaign can be so it give me pause to not put some limits on the scope of the campaigns. Please make a suggestion on how you might phrase the scope of work so that I reign in the size of potential campaigns? The good new is this is a client that does not even have a CRM and does not currently use marketing automation…but that could be bad too. Any suggestions are appreciated.