Can you tell me what as a company we will be measured on within SAM to achieve CMMI level 2?
The answer to your question has several parts.
First, is SAM applicable to your company?
SAM, or Supplier Agreement Management, is the one Process Area in the CMMI that can be considered "not applicable" by your Lead Appraiser and Appraisal Team. SAM is usually applied if you engage an external provider to perform a service or build a product that becomes part of your company's product or service offering. Some appraisers have said they include SAM if ANY product or service is purchased by your company - I disagree. Should you perform SAM for buying pencils, pizza, and toilet paper? I don't think that was the intent.
Second, the model itself outlines the Specific Goals that are required, and the Specific Practices that are expected to be performed to achieve them them:
SG 1 Establish Supplier Agreements
SP 1.1 Determine Acquisition Type
SP 1.2 Select Suppliers
SP 1.3 Establish Supplier Agreements
SG 2 Satisfy Supplier Agreements
SP 2.1 Execute the Supplier Agreement
SP 2.2 Monitor Selected Supplier Processes
SP 2.3 Evaluate Selected Supplier Work Products
SP 2.4 Accept the Acquired
Remember, the SG's are required. The SP's are only expected.
Finally there are the Generic Practices. If your attempting to achieve CMMI Maturity Level Two you will have satisfy GG2 and all of the GPs GP2.1 - GP2.10.
GP 2.1 Establish an Organizational Policy
GP 2.2 Plan the Process
GP 2.3 Provide Resources
GP 2.4 Assign Responsibility
GP 2.5 Train People
GP 2.6 Manage Configurations
GP 2.7 Identify and Involve Relevant Stakeholders
GP 2.8 Monitor and Control the Process
GP 2.9 Objectively Evaluate Adherence
GP 2.10 Review Status with Higher Level Management
More detail is available in the CMMI model itself.