I suggest dividing your services into transactional services (like hosting, updates, or design work) and consultative or strategic services (like consulting and marketing campaign development).

Transactional services can be project, hourly, or retainer based (i.e. $5,000 for a new website, $75/hr for ongoing design needs, or $200/mo for updates). Consultative services are better on retainer (i.e. $500-1000/mo to advise on the best keywords, review copy, and report success).

From a business perspective, the more clients you can fit into a monthly package, the more efficient you'll be. Let me know if I can help in any way!