TTRAG has survey forms that will cover all the points.

My suggestions are to first understand the building. Learn the lay-out method, look for references and earmarking from chisels or race knife, and order of construction most easily seen with under scarf piece placed first and by reference reversal at the last wall.

Draw a plan and typical elevations, designate the timbers based on the original earmarks. If you don't see earmarking assign a system. The common american practice is usually a grid system with alphabetical and numerical cooridinates. Number the bents 1, 2, 3, etc., in construction raise 1 first. Along the gable label post lines alphabetically, place A at front.

You can make your tags at home out of flashing. A 1 x 2 strip is fine, with letter punches mark the tags.

Take down the building in reverse order, tag the timbers and mark reference side.

Good luck.