Thanks for your reply.
For #1, I recommend any display with DVI or HDMI and at least 1080p resolution, if not 1024 x 768.
You'll need to properly identify which MacBook x,y you have in your System profiler, where x and y are numbers to tell you more about which connector to get.
Should any display that fits those specs ("DVI or HDMI and at least 1080p resolution, if not 1024 x 768") work 'out of the box' (no additional hardware required, other than the connector)? That is, no other 'compatibility' or other issues?
What do 'x' and 'y' stand for? Do they refer to the 'model identifier' spec (which in my case is MacBook1,1)? If so, what does that tell me in terms of "which connector to get"?
And do you mean that standalone monitors are generally sold without any connectors, so the connector has to be purchased separately?
For #2 no operating system serves displays differently, except 10.9 can add a menubar to a second display. But your machine based on the speed probably either maxes at 10.6.8 or 10.7.5.
Please explain what you mean by 'maxes' -- you seem to be indicating that some (or many) current monitors would exceed the handling capacity of my MacBook, but I'm not sure. If so, due to RAM maxing at 2 GB, or for some other reason? I use 10.6.8.