So all a team has to do before an ICO is to make a smartcontract for the token and the crowdsale only? After they have raised enough capital after an ICO, do they than work on the MAIN smart contract

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Exactly that's if a smart contract is involved with your startup. Many blockchain startups don't use smart contracts for their proof of concept and to validate their ideas. It's of course your call depending on what you are planning to achieve and problem you are trying to solve through your ico
You are correct.