Go for a coffee table 18" from the two chesterfields which should face each other. Side tables need to arrive 1" above or below arms of the seating piece. I don't think you'll be happy with anything tall enough for the sofas. Get a side table for your chair, and consider two chairs and one sofa. The floor lamp looks to be for the bedroom or ladies dressing room. It is too feminine and fou-fou to work with your seating pieces. If you have a teenage daughter, she'd probably love it in her bedroom. I presume this photo is your inspiration. The side table shown here is too low to be used by anyone sitting on the sofa. It might work with the spool chairs (1" rule) and you're right about needing a floor lamp, just not that flowery one.

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I think that this sort of tufted leather sofa should have side tables that have a traditional style. I favor darker woods with simple scrolled leg and details. The height depends on whether or not you need to frequently access the tabletop. The sides of the sofa are tall, so you need to think about what will go on it.