You don't have to join any site, go to your local library and use ancestry.com library edition for free, if you decide the hobby is for you then maybe join a site alot later on.
Start by reading my beginners guide under the 'articles' tab in the family tipic, (no idea why the ed put it there lol)
If you have any graves in the family visit them and record the info from the memorial inscriptions on the stones, check to see if there are any older gravestopmes the family know of.
Most research can be done for free, I advocate that stringly, as millions of people created these records for free.
Write down everything you knwo so far, then see what you have to work with.