Navigation is the most important aspect of any website.For a dating website, the most important navigation controls are those that link to the profiles of others, profile creation tools or templates and chat. Red, for example, is associated with fiery love and passion, and may not be as appropriate for a website themed for "sweet" relationships. Make getting a good balance between your revenue sources and the true purpose of the site a goal for every page.
If so, there are dating apps and sites specifically designed for this very purpose.
Keeping the site free, rather than subscription-based, can help grow your user base but it means you'll have to design your service around generating revenue from other sources.
Look at other online dating websites to determine staples that your dating website must offer to be competitive.
Alternately, hire a programmer to build the site -- this is much more expensive but allows the most customization options.
Use your information from Steps 1 and 2 to determine the overall design for the dating website.