Our floor plan is almost square, yet with a (staggered) gable roof.
To the back (that is south) lie our living-cooking-dining areas. Southeast is the kitchen area with the dining area to the south; from there the living area opens up (only separated by stairs), covering the south and west sides.
A terrace door (1 meter) from the kitchen at the southeast corner, a double door (2 meters) in the dining area to the south, a terrace door in the living room to the south (next to the double door in the dining area due to a small offset in the house), and another double door on the west side.
The largest garden portion is to the south. The terrace is not in the southern heat but at the east/south corner because we like going out from the "living kitchen." Hopefully, the sun will still shine from the west in the evening there, unless the neighbors block the sun (but that will only be known later). Possibly the terrace will be planned further south. The other terrace doors naturally connect, yet the terrace for garden furniture will be on the side. 2nd terrace in the west with a sofa, 3rd terrace somewhere in a garden corner. Depends on the sightline.
Sightlines: Yes, when sitting at the dining table, I would like to have a nice view of planned design elements in the garden. When sitting on the sofa, I do not want to look at the path lighting at the end of the property. From the terrace, I also want to look at a "chocolate side" of the property, but I can influence all that with planted hedges and trees. Personally, I am not a fan of a terrace in the middle where others can watch me. In that case, privacy walls would be set up so you are not seen, which would also block your own nice view.
But you have to figure that out yourselves. What is around the property?
Most rectangular houses have a corresponding gable roof orientation. If you take the ridge side to the front, an entrance on the side is suitable. (I have avoided this and like front-facing house entrances.)
If you place the roof side to the front, a front entrance is also suitable for you. If the house is then 12 meters long, with a 20-meter property width, you still have 8 meters. With a 3-meter boundary distance (on both sides), you have a problem with a side garage. However, if you are allowed boundary construction with the garage, then you have space for a single garage but no double garage. If you need a double garage or 2 parking spaces side by side, you have to rotate the house (ridge side to the front). Most then build a garage at the back and have the driveway next to the house. If the garage is then on the west, you would have the option to place the terrace in the house/garage corner. This would be advantageous due to wind direction.
Now I have written too much... and lost track.
If you already have neighboring buildings, I would just stand on the property and let it affect me. Yes, and then comes the house design... juggling rooms and windows.