question about thevenin and norton calculations

[kars]

hi, for school i have to make some assignments but im a bit stuck on one of them.
in the picture, Uv= 8v and i had some resistor values witch i already managed to assign to the right resistor: R1=12ohm R2=47ohm R3=68ohm and R4=33ohm (Uxy had to be 3.5v).  calculating I results in 0.2A.
next they ask how you can calculate U_thevenin, R_thevenin I_norton and R_norton. the only problem is that i just dont understand how, my textbook makes calculating steps i dont get and yt videos use completely different schemas so i dont really get any help from them either.
could anyone help me with this?

[Assafl]

What is the load (or if it is there - which resistor is it?). For these you first remove the load, calculate the voltage, and then remove the source and calculate the thevenin equivalent resistance.

[IanB]

I assume the load is to be connected between X and Y, so the question is what are the source characteristics looking into the X-Y terminals?

[MattHollands]

Always a bit worried that I am providing too much when it is a school question, but I have attached my partial working for this problem.

Basically, to find the Norton version, you need to find the short circuit current, and the open circuit voltage. From these you can easily create a norton-equivalent circuit.
NB. (Rx||Ry) symbolises the resistance of resistances Rx and Ry in parallel.