The White Paper
One of the must-haves of any ICO is its white paper. It's a complex document that should clearly explain all the details of the blockchain project and its practical use to the potential investors in an accessible way. It's the way of making the first — and, maybe, only — impressions.
There are a lot of estimates but they meet at the reasonable range of $5,000 — $10,000 but it's not uncommon to spend up to $15,000 for white paper alone. The price depends on many factors, among which are: complexity of your ICO project, qualifications of the technical writer and the length of it.
Note: your white paper is a significant part of your image. Don't cut these expenses too much, so that you don't end up with low-quality document that would turn your potential investors away at first site.
Today having an attractive and user-friendly website is obligatory for any business. Of course, you could get by with a rather simple site and spend no more than $5,000 on it. But blockchain project usually require more sophisticated resources with features and tools that common business don't.
In general, website development for ICOs costs somewhere from $10,000 to $20,000 depending on your requirements.
Note: even though in modern conditions it's not a problem to develop a website single-handedly — there are plenty of resources that allow to do that with barely diving into the code — it's better to have a professional web-developer and web-designer. They possess the necessary skillset and would focus only on making the greatest site possible, leaving you and your partners to more pressing business.