Good morning Fritz. It looks like you have created basic profiles for your Maher ancestors. I would recommend starting by documenting and adding source information for what you already know.
For example, where did you find Thomas' date of birth and immigration? How do we know he married Ann Dant? By documenting the sources you have already checked, it will be easier for folks to recommend new avenues for research.
The Irish Roots Project may also be able to help suggest research strategies for you.
Great! Census records are a great place to start. Go through each profile and document which Census records have been checked and which facts were validated by each record. There is a wikitree help page on Sources that should get you started.