I am UI/UX expert.
If u have a startup idea and need help with prototype , graphics and html5,css3 development - u have found the right person
So here are the steps i use in my work
1. Analyzing tech specs
2. Suggestions layout, site functions that will help people to use your site/service better
3. Building prototype in Axure to show site structure and interactions using dinamic panels - to show how the future site will work, on this stage i can prepare pretty good demonstration of your idea for all of the people invol