Usually RFP ( Request for Proposal) is something you get ( in the form of a template with specific questions ) from larger procurement organizations i.e. Global 2000. If your customer is large they probably have something like that or at least a guideline that you could follow to ensure you are answering every question. If its a smaller company I would think your sponsor (at the customer) is looking for proposal from you with details about your offering and pricing to share with others. There are different ways to handle each of the scenarios so it would help to know which case are you dealing with
Generally you are better off sticking to their format. Procurement people get confused easily and thats the last thing you want to hold up your bid to secure business.
Also, if you didn’t write the questions on behalf of the company, you are likeliness of winning business is very much hampered. The best tactic in that case is to see if can figure out who wrote it and specifically attack their weakness in your answers.
Usually the customer gives you access to their procurement online system, you download a pack of docs which you have to fill out with FullCompliant/NotCompliant/PartCompliant, explain a several hundred answers, sometimes thousands, and then upload your response/proposal back to online system. Customer ALWAYS gives their template of RFP to answer. If you receive a final RFP, most likely it was written with some other vendor’s help, which means you probably already lost the deal, so it makes sense to influence what requirements they put in RFP as early as possible.