Transferring Data from SugarCRM to Drupal and from Drupal to SugarCRM

Hi,
I am working on how to connect SugarCRM with Drupal . I searched about this, and there is no module which can transfer data from sugarcrm to drupal and from drupal to sugarcrm.Actually I need to get all the leads created in the crm in drupal...and the project estimation which is done on drupal should automatically be transferred to the lead...and after the completion of the project ,the bug report submitted by the client should be transferred to the drupal. Its actually using Sugarcrm as client side and drupal (Open Atrium) as internal side ...means using drupal (Atrium) as a project management tool... For this to do i need to write web services, but i am noob in web services .. so any one please can tell me what are the things i need to know in order to connect Sugarcrm with drupal using web services (soap,nusoap,wsdl )..or if there is any module for this.