I am a new customer to Salesforce.com and I need some help customizing and developing this platform for my company. We currently have the Professional Edition and we have 4 users. 

Our business is in the financial services and we are in need of the following:

1. Help with building custom objects

2. Linking objects

3. creating relationships

4. Custom lists

Our needs are probably pretty basic right now but as we start using salesforce.com I am sure we will need to add additional fucntionality in the very near future.