In gameplay constants theres a "Max Hero lLevel" field, change that, also make sure the xp cap isnt to low, and you fix the creep table.
now about the lumber thing...
there isnt a trigger to do that, to do it youll have to find what icon it uses and replace it with what icon you want, and then find the .txt file that has the tooltip in it and change that, then add them both to your map with the import manager.
oh and if you dont have tft but have RoC, then you cant do the level thing and youll have to use WinMPQ for the importing | 
