Net new:
Contact / Company creation source: any of the non-offline sources
Deal associated = Known, close date = known, deal amount = known
Influenced:
Contact / company / deal Creation source: any
Last signifcant interaction before creation of opp : marketing efforts (its mostly email)
The usual good metric is $$ sitting across pipeline. In early stages (pre-proposal) and late stages (post-proposal)
Real impact = all of the filters above + deal stage = closed won