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I'm right in the middle of doing all this homework myself. There is an astonishing amount of unhelpful information out there.
I rec. using led lights that you can change easily when they time out. The cheap ones use a led chip that requires the whole fixture to be changed. For your posts, that will likely be the case. For spots and floods, those use MR11 or 16, or bipin G4, or similar.
Calculate the total wattage you expect to use, add in any additional you think you may want, and add 25% of that on top for a total wattage. That will be the wattage your transformer will need to be to run your line, plus a little headroom.
Long run wiring will require heavier gage, and the number of taps figure a little into the equation when using led, and a lot when using anything else. There are calculators on some websites, but that is where a lot of the unhelpfulness lays.
Best with your project
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