I’m not that great at this so let me ask you this, you said it needs a switch coming from the black and yellow wires. To check that it works before getting a switch, is stripping the two wires and just putting them together the same thing? just to see that it’s coming on? And if it’s working I’ll go to an electronics store and get an off/on switch after that.
Yes, that's all you really need to do. In fact you could just leave the plug as it is and use a paper clip or something to momentarily connect
the black and yellow wires. When you slide that tiny power switch on there's a tiny red light inside the camera (kinda hard to see actually)
that will be a steady red, when you connect the yellow and black wires together (only for maybe two seconds) that light will be blinking
and then you're good to go.
The type of switch you want is called "normally open" (N.O. for short) and also "momentary contact" (Mom or M.C. for short).
This means the contacts inside the switch are not making the connection (open) until the button is pressed (closes the switch).
Momentary because some switches stay in either position (open or closed) after you've actuated them, you want the type that
only remains actuated for as long as you're pressing the button.
You only have one wire connecting to another one wire so it's called a "single pole" (S.P.) and the actuation is only going one way
(connecting) which makes it a "single throw" switch (ST), these two terms are always found together in a block of four letters (without
periods between them) like SPST, SPDT, DPDT, etc .... So, you want an SPST switch. Adding being normally open it's a N.O. SPST switch.
Adding momentary action it's an N.O. SPST M.C. switch.
You want it to be as small as possible, so it's a "micro" switch. And it's a pushbutton type too, sooooo what you want is a :
N.O. SPST M.C. pushbutton micro switch