What kind of lawyer do I need to dispute my father's will.

My father passed away July 01, 2018. My mother originally claimed she could not find the original will, only had copies (with the notarized seal) and put everything in her name (the will says "things" were to be split/ shared). Now she claims my father told her she was to get everything (there is nothing written down stating this). I simply want what was written in the will, so she can't just sell everything out from under me. My uncle (me father's brother) is the Co-Executor of the will.