Probably you just started your ICO and still do not know if you need a smart-contract now, but soon your first investor will write to you and ask to check smart-contract for legality and if you do not send it within 24 hours with 99% probability this investor will leave. It was experienced by all ICO:)

You do not understand anything in smart-contracts? We will record for you personal video of how to properly use and test your smart-contract and you will immediately understand everything.