Oil filter is at the back of the engine. Easiest way to access if you're doing in on the ground ( I.e no ramp to lift the car up) is to remove the front right wheel and wheel arch liner. You will see it then. It has a black cap and you will need a oil filter removal tool to release the cap, it can be quite tight.
As for the sump plug, you need to remove the under tray and it's a silver plug. I think it's a 13/14mm socket head. You don't need to fully remove it from the sump, about halfway and it will drain the oil.