First of all you need to do your research and find an ICO you want to invest in. If you are looking to invest in an ICO I recommend checking out Propthereum.io, an asset backed cryptocurrency on the blockchain. Proceeds raised from their ICO will be used to purchase A-grade property worldwide. This property will generate a rental income and underlying value for the PTC token holder. Propthereum.io is the first coin in the world to be backed by property. The great thing about this concept is that the coin will always increase in value. They are live now so you can invest. Check out their whitepaper to find more information about their business plan.