The cracks are a foundation and shifting earth problem. Meaning that they will shrink and expand with the seasons. The only way to fix those is a house jack system.
So, I would not even address that problem. What I would do for the cracks is to get some paintable latex/silicon caulk and force it into the crack. Then paint it. Now when the home shifts, the expandable caulk will hold together and go with the crack.
Now the hole. Is the metal lathe gone also? If the metal lathe is there than all you do is to mix up some compound and trowel it on and let it dry, then add more on top of that and do your texturing.
If the lathe is not there you need some sort of foundation or backing for the mixture to adhere to and to not fall back into the hole. If the hole is 4 inches, then get a 1 x 4 and cram it into the home and set it behind the walls with the 4 inch side against the walls. Then screw a screw on each side of the hole into the stucco wall then into the 1 x 4. this will hold the board into place. Now cut a section of metal lathe the size of the hole and staple it to the board that is in the hole. Now you have a foundation for the new compound to adhere to. Now continue on with your patching job.