OK, here is the all the 19" wheel info in one place if you want to stick to OEM specs:
Rims
Rims are $745 per, regardless of size:
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Wheel Trim
You will need some sort of trim, either the Tempest wheel covers or center caps and lug nut covers. The Tempest covers are $30/each, the center caps are $15 each and the lug nut covers are ~$1 each. You can get grey center caps which a slightly darker than the wheel or black center caps. You can see the two options in this post:
#26
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Tire Pressure
You need TMPS modules and stem caps. The new cars use a BLE (low energy Bluetooth) TMPS module, so you need to get them from Tesla, they are $75 each--these are different units from prior models. I am sure 3rd party modules will eventually hit the market, unless Tesla is doing something weird with the BLE. The caps are a few cents each.
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Tires
The Tesla spec for the tires is as follows--the top number is front, the bottom is rear:
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I have found two tires that match that spec (I am sure this will change constantly, but this is as of this writing). The Continentals what Tesla supplies. The Michelin are what I went with. Do your research and see what works for you.
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Hope the helps.