How can I integrate Sugar Open Source to Real Estate site?

We want to integrate Sugar Open Source 4.5 to our Real Estate System (Property site). I mainly need sugarCRM to be use as for internal management of the organisation like handling property enquiries & listings which are coming from front-end by end user & site members and then assigning those property enquiries to the team for follow-up process.

If anybody can help us, it will be really appreciated?