The entire process of finding and signing up forest carbon stocks has taken on a "land rush" mentality. Since the markets are still being developed, every landowners wanting to explore selling their carbon offsets should remember always - "SELLER BEWARE".
If you are looking for an aggregator, or an aggregator contacts you, first and foremost make sure they are registered with one of the established carbon markets (CCX, Oklahoma Conservation Commission, etc.). If they are not, STOP! Do not pass "Go" because you could be entering into a legally-binding agreement with someone who has no access to an operating carbon exchange in the U.S.
Once you have verified that you are working with a actual approved aggregator, then read the contract carefully and make sure you feel comfortable with the aggregator. Ask about carbon pool amounts, verification fees, aggregator fees, etc.