An excellent way to transition to pipe welding is to weld plate first.
As long as thickness, bevel angle, gap, and land are the same, the same settings work on pipe so it makes sense to establish settings on plates
Sometimes welding procedures specify downhill root and other times uphill is specified. It is great to be able to do both so you will be ready either way.
uphill root voltage and wire settings are a bit lower but is really not more difficult than downhill once you nail the settings
In this video, I go over mig welding settings for short circuit mig welding in horizontal and vertical uphill. Also a quick tip for vertical uphill settings. Arc shots and techniques are shown in detail.