TEs don't really have complicated route trees like WRs. Really it's more about finding space in the zone. Coming from a QB position I don't think he will have a hard time.
Don't you think he will be more of a move/hybrid TE that splits out and runs WR routes? I just can't see him consistently being used an as in-line blocker. He seems more likely to be split out or put in motion running WR routes as basically a big slot WR.