I agree with Snaqs on the positioning infoo. The rule of thumb is to go where you need to go to referee the play. So there is no (or should be no) hard and fast rule about where exactly you stand in relation to endline, sideline, etc...
As for the tip...if the ball is tipped deep into one team's backcourt, retrieved there by the team going the other way, and there is pressure on that player - you need to get back there to referee that situation. The R will need to run down and become the Lead. Other than that situation, wait until you see who has possession and then sprint to where you need to be.
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