Dave Chicoine's books on 'Gunsmithing the Guns of the Old West' and his follow-on dealing with modern C&WAS guns are indispensible, as is Kuhnhausen's on the Colt Single Action.
Armed with those - and some 'good' tools from Brownell's, and coupled with patience and common sense - there's no need to spend money on any internet course.
The only reason to spend money on a gunsmithing school's offerings is the personal, hands-on instruction in a classroom/workshop environment - otherwise, buy books, set up a work area, and proceed slowly.
Most C&WAS guns can be worked on quite easily - and stoning various surfaces is pretty much all that's needed - and though opening up a forcing cone is sometimes warranted - there's a tool for that, too, so get yourself a Brownell's catalog -
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