Hi & welcome!
Simplest would be a voltage divider. You need two resistors, just google it, should be pretty straight forward. But this only measures the voltage.
If you want to measure current consumption as well, get an INA219, INA226 module from ebay / aliex.
2: Yes, 3.3V max!
3: Well, there are all kinds of starter kits, can't recommend one. Cheapest would probably be ebay / aliexpress. I guess also depends on where are you and what you want to do. Sensors? Actuators? LEDs? Analog stuff? Radio? Tons of options :)
Thanks @AkosLukacs. I'd already investigated voltage dividing.
I've purchased 2 x INA226 modules so I can get something up and running.
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