Welcome to WikiTree, Paul. The best way to find others working on your same family lines is to start adding what you know - add your parents and then their parents and find sources for each profile you create. That will help to add locations and might attract others who are working on those same lines. Create tags for each surname as you can then click on the tag and see who else is researching that particular name or location.
Good luck and please ask questions as they arise. There are a lot of people here who will help.