Implement Zoho CRM.

I would like to implement CRM for my company. We are mostly a Business to Govt (B2G) business. Our primary customers are Govt Customers with long cycle of procurement. We have been using the Zoho CRM for a while but not fully. We have about 5 users. We can increase the number of users based on the need. We need an expert to help us set up the Zoho CRM and then customise it to our requirements. Also do let us know how you ensure the security of our data.