I have a home that is about 90 years old and all the Walnut trim in my
house is original, yet needs some TLC in order to bring it back to its
original luster.

I have never undertaken anything like this, and would like to know if
there are any good resources on the internet that you all can
recommend? I need advice along the lines of stripping vs. cleaning,
and sanding vs. chemical cleaners. Also, i am really fuzzy on whether
or not I would need to re-stain the wood after I either sand it or
strip it. Like I said, I am a rookie.

Any recommendations would be greatly appreciated.