Resources
You can find the appropriate Child Support and Financial Affidavit Forms at this link:
http://www.courts.state.co.us/Forms/SubCategory.cfm?Category=Domestic
Here are some direct links to the most common forms:
Separation Agreement (with Children): http://www.courts.state.co.us/Forms/Forms_List.cfm?Form_Type_ID=14
Separation Agreement (Without Children): http://www.courts.state.co.us/Forms/Forms_List.cfm?Form_Type_ID=68
Child Support Worksheets: http://www.courts.state.co.us/Forms/Forms_List.cfm?Form_Type_ID=94