build a crm system for my buisness for sending price offers and schedule workers and clients

i need a system that work as a crm
first a lead contact us we fill his details- schedule a meeting for price offer
a reminder sent to user after schedule- user can approve or decline of ask for reschedule
after the meeting we send a price offer- we have a doc tamplate we change with all the services we offer
so user gets a price offer he can approve
after he approve price offer he has to approve and sign the contact
then he can choose a schedule