The tools are there, the hard part is putting together a concept that will attract people as members.
If you have considered starting a website, you need to write down the reason why.
You will need to decide if your site is going to use a paid membership model, where people have to pay to be a member, or a free site but where people have to pay to actually make contact. One of the most successful dating sites in the world is 100% free for users, and it makes millions of dollars from the banner ads it places around the site. There are dozens of different scripts and systems available to build your dating site.
The most successful sites are not the ones with the broadest appeal, but the ones with the narrowest. It is the ability for people to quickly identify others who have the same attractions that makes a site popular.
By clearly identifying who you are making the dating website for, you will stay focused and be effective as you move into designing and marketing your site.