Have played RB a fair bit, and I'd advocate showing them down the line at every opportunity, as from past experience a lot of LWs are right-footed, so of course prefer to cut inside.
So, showing them down the line onto their weaker foot would be advisable. Of course, best to quickly ascertain which is their stronger foot, and judge accordingly, if they have a sweet left-foot, might not be advisable to always show them down the line, but more often than not, I would show them down the line and use some pace to put the ball out for a throw or something.
In attack, see what the manager/captain wants, might not want you bombing forward, that was always the bit I found toughest, as physically it's tough trying to be up and down that flank, but I suspect a lot of the wingers will be lazy and not track back, so you won't exactly want to bomb on and get caught with him behind you.
Also, just keep an eye on who the defensive leader is, they'll call the line, and how deep you are and when you push up to perhaps play people offside.
