...My usual approach to things is do first think later but I'm aware that's not sensible
...You may think this is lazy
...
EDIT: also no offence taken appreciate the advice and I'll try read up on what you have mentioned.
My Friend,
I don't believe anyone here thinks you are lazy.
(Judging from how I feel about this...) The discernible lack of response to a simple question is
probably because
no one wants to be involved with what would be equivalent to a suicide attempt.
Ambition is a great motivator of learning. Then again, trying to learn to fly by jumping out of an airplane usually doesn't work regardless of the level of enthusiasm.
Reading up on it first would be a good thing. You need to know Kirchhoff's current law and Kirchhoff's voltage law both, and of course Ohms law. While anyone can easily cut and paste the definitions here, doing so would short circuit your learning path. The knowledge you will gain by the research and then understanding that three laws are the knowledge you need to do projects like this.
Prior to attacking the two Kirchhoff's laws, you need to know Ohms law first, and then how to deal with serial-resistors and parallel resistors. Then you are ready to attack Kirchhoff's laws. Lastly, you need to read up on voltage measurement and using shunt resistors to measure current.
Once you get these few things under your belt, you would be able to figure out answers for your questions easily - plus, being able to do some debugging of the circuit after you put it together.
Best of luck!