*Writing of Whitepaper
*Coding of the Smart Contracts and such
*Promotion known as bounties
*Aesthetics of your ICO (of course it should stand out)
Consider these on how much it might cost on your launch. Consider the people you're gonna be with in your upcoming projects because they might be also pull you down when things go wrong in the promotion of your project.
Really depends on your own skillset also, if your a fully fledged blockchain developer costs will be lower to launch a viable project with a working proof of concept to show potential investors