I don’t think there is enough to do for an Italian player. Truly they are at the mercy of the Germans in all aspects.
Russia is designed to operate on their own (and needs help from the allies but can operate without it) and even benefits from the lack of Allies on its native soil (national objective #1).
The Italians provide the benefit of being able to move after the British, however anyone would say (at least I think) the Italians would be far more effective if they could merge with the German forces and act as one nation (combats, purchases, shared IC’s etc). The separate power of Italy adds an interesting dynamic but overall I think weakens the German position as compared to Revised.
Some might argue that a beginning player should play Italy but I think you are doing them a diservice but not allowing them to deal with a full budget, or have their moves create meaningful situations.
warning: possible political incorrectness ahead!
As for a Chinese player, I would only have a stripper play China so after spending 2 minutes doing moves(maybe another 60 seconds explaining the rules and 60 seconds to actually do moves), she can get back to entertaining. Conversely, if the stripper is not appropriate maybe when the pizza guy delivers a pizza, you can have him do the moves. After turn 2, China is kind of silly (the nation in Axis and Allies, not the real world China or people of Chinese decent).