How much voltage/current do I need for multiple chips?
You need a voltage regulator for the esp. Preferably a dc-dc step down, which will neither waste power nor heat up. Other, passive solutions are possible but not desirable. The regulator can be found on ebay amazon etc.

EDIT:

One more thing about the LEDs: depending on the model you have, they might or might not work with 3.3V input (I'm assuming you want to drive the LEDs from the esp).

In case they take only 12V input, you will need some interface solution, like this one, for example.