>>38572
I'm lacking the jargon of the electricians in English, and I've lack time to look them up, so some will be spot on by mistake, some lazy translations, some kind of a mirror translations. But gonna include images to avoid misunderstandings. Here we go.

First I would plan the route of the wires and placement of the appliances.
There has to be a distributor box somewhere by the door and above it. Round (pic #1) or square (pic #2), sunk into the wall or above it's surface (I think the round is always in the wall). Plan the route along the wall, horizontally at the level of the box, following the corner(s) to those sockets by the boiler. I think those sockets are more or less at the same height as the distributor box.
At about halfway that wall, behind the shelves you installed, plan to fit another distributor box. So one line will run from the box at the door, to this box at the half of the wall. From this halfway box I would draw three other lines, one horizontally to those sockets already installed at the boiler, one downward to almost the level of the table, where I would add another socket, actually probably one with three sockets (pic #3). The last one will run up to the ceiling, and then to the middle of the room, for a socket of a single bulb (pic #4).