There are a lot of sites online. The first place to start is talking with your family and obtaining birth certificates, marriage certs, divorce certs & death certs. “Interview” any member of your family that you can to get as much information you can. The first link I’m going to give you… Cyndi’s List is a great reference for sites on the web. This is the link to the LDS online information. From this link, you will be able to search what information may have already been researched on your family. You will also be able to find a LDS Family History Library near you. You don’t have to be LDS to use their records. Your family doesn’t have to be LDS to end up in their system. If someone else, maybe a distant cousin or someone may have done research and it will be online. You won’t be finding any information for living people online tho.
Use Cyndi’s site as a guideline how to begin searching and where to write for certificates if your family won’t give them to you. There are tons of places online but it sounds to me like you are still at the beginning stage where people are still living and you won’t find that online.
If you have any questions, email me. I’ll try to help you get started researching. It’s not as easy as finding it already done for you. If you decide you want to hire a researcher, let me know. I can help you with that as well as pointing you to a site that will tell you just what to expect from a professional.
I totally agree with what Mississippienne has told you. I was “bitten” by the genealogy bug in 1976 and I’m still addicted and have done research on my family as well as my husbands and I’ve had a few clients over the years. It’s a great hobby/addiction!