I want to try my hand at carving a stock

I have a semi-inletted stock that I picked up cheap and want to fit it to a 1923 LC Smith FW field 12 gauge action. The wood is just plain ole black walnut. Nothing fancy.

Can anyone give me the summary order of steps in fitting beyond disassembly of the gun and any broad brush stroke tips. I am assuming the first step is fitting the top tang square to the back of the receiver with keeping the orientation of the side plates in mind?

I know this is something for the pros but the pros started out just like me.

I am willing to mess up for the education.

Many thanks

Travis