At least 80cm to 1m wider and longer than table will allow chairs to be pulled out etc without rucking up carpet. Your local carpet shop should be able to cut you a remnant or off cut to size and have the edges whipped to form a rug.

Generally we find our clients look for furniture that is flexible and can be configured in multiple ways. Obviously long life and ability to resist the elements are paramount.

I think you're right jessa61, about waiting. The thing is, as you said, you're not in the house yet. When you get in and the floors, walls are ready and the main sofa is in, then add to it. You may dislike what you have in your head as soon as you see it all in situ, you may not. I really like the last table you posted, it's great with the sofa, and, in truth, i actually really dislike all the thin framed marble top tables around at the moment. It's not a trend i'm on board with. I would definitely wait for the accent chairs. Chesterfields are beautiful and statement pieces, however, they can be uncomfortable to sit on for long, there's no upper body / neck support and you can't lounge on them. So, this is why i personally think they go very well with high backed armchairs. You lounge on the armchairs with your feet up on the footstools. Also, you say you want two footstools, which is great to go with the armchairs, but you sound like you want to sit on the sofa and have them in front of you, which will be difficult with a coffee table in the way. The footstools can stay with the armchairs and be occasional seating, yes, the chesterfield needs to sit with the coffee table in front of it, not footstools. I think the side tables are a good idea, i'm not sure about the height you need, i'd wait to see how you use the seating before deciding. The height may be irrelevant and you may not want lamps on them at all.

Adele, I agree with Ellie and that a standing lamp would be better with a plant on that table. You say that your dining chairs are 'burnt orange' but the one in the photo looks rather like a shade of brown. These physalis (Chinese lanterns) are closer to burnt orange to me... The lamps are too 'orange' but impressive. Ikea do one (that I have) but it's only available in charcoal grey...