I want to create a simple website for my crypto-related startup project. I know the basics of HTML and CSS code, but I've never created a web site before. What I want is a simple but professional looking responsive design with simple navigation.

What do you guys think?
Should I hire a professional website designer for such a website?
What are some recommended website design tools?

Please note, my time spent on this project is not a problem, there are no deadlines.