On mine..same old..boring ..the lamp, the book - Gone Girl, telephone, photo frame-hubby & me and the coaster where the glass of water was..oh and dust.

Unless the wood looks tired I wouldn't bother but if you want to then go for it

You will need to turn the table over and look on base to see if there is enough width in the frame to mount legs in all four corners. Alternatively you could get a plinth base added. This could be a block under each side that would look like legs from front or a solid piece. I would glue then on

Is the only possible orientation of the bed against the external wall? What sort of bedside tables do you want? Is the external wall somewhere where your choice will make a big difference to the external appearance of the house? Windows on either side can look good but I think you need to plan more in advance if doing that rather than a window on another wall. For example if you need a lot of bedside storage and powerpoints maybe shorter windows above the storage is best but full-length works with simple tables and pendant lights. You need to think about the size of the bed in case you want to get a larger bed in future or for resale value.