Lots of things here.
Just a fair warning and I dont mean Van Halen but…

The questions you ask about….
Will get you some smart alic response's cuz that topic has been beat to death like a serial killer on a victim! Unsolicited advice here would be (don't take offense like some) is to type it in the search and read all about it like when the Titanic sunk

Lets see….

also

there!
Yes 28’s is the biggest you want for everything stock.
You cant do that! Well you can but will look funny cuz the rear “wheels” are wider than the fronts and the same size tires will make it look like a Poo Poo riding the short bus.
If u go same size all the way around need and suggested to have the same size wheel. Then you will need Spacers to fix the trac. See our vender friends
@RB3offroad for those when your ready to step into the big boy shoes lol.
Note: If u do the stock wheels with the stock tire width for front and rear but a taller tire, no spacers needed. Its a preference at that point.
BLAHAHAHAHA you are mistaken my friend! You joined here! We will have u wrenching on mods every weekend of your life. If you dont believe us, use the search and find out it never ends

Dont forget pics of whatever set up you do from this. Inquiring minds will want to know.