I'd just contact the organization you plan to do your apprenticeship through and ask for a tool list if they have one. If it's union there will very likely be a tool list. If it's nonunion they may not. Go from there. Work on getting everything on that list.
Klein is well regarded in the electrical trade, but they're a little overrated in my opinion. I have plenty of Klein stuff, but it requires taking a close look when I'm buying it to make sure it's in good shape because their quality control is lacking these days. I think they make terrible benders, rotosplits, and Channellocks. Other brands to look into are Ideal (who makes the best strippers in my opinion), Greenlee very selectively, Southwire very selectively, Wiha, Felo, Wera (though I'm not a fan), Knipex, and Milwaukee. Things like levels and drywall saws are usually rebranded for Klien so don't pay the premium for them. Eklind and Bondhus make great allen wrenches.
To start you should get:
-Nine inch linesman pliers
-Two sets of Channellocks at about ten inches (I caution against Klein here unless they're the NWS made version)
-A pair of eight inch dikes
-Seven inch needle nose pliers
-Strippers (consider a pair of stripper needle nose combos. Klein and Milwaukee both make a pair)
-A drywall saw (Don't spend a lot of money here)
-A plug tester
-A hot stick
-A six or nine inch torpedo level with rare earth magnets
-An 8"adjustable wrench (I'm a big fan of the Protos though Bahco is well regarded too. Also, consider a pair of Knipex pliers wrenches)
-A set of allen keys up to 3/8" though 1/2" is even better
-A multibit screwdriver (Klein is the gold standard here)
-A large flathead beater screwdriver (Don't spend a lot of money. A Husky will work just fine)
-A stubby multi bit screwdriver (I really like my Wiha)
-A set of SAE nut drivers (get the one that have a hollow shaft all the way through. Klein, Greenlee, Lenox, Xcellite, and I think Milwaukee)
-A 25' tape measure (I'm a **** for the Fat Max)
-A utility knife (The folding and retracting Dewalt is my favorite)
-A claw hammer with a soft face. Waffle faces increase the chances of ******* up Romex. Don't spend a lot of money.
-A set of crimpers unless your strippers or linesman pliers have them (though I still prefer a dedicated pair)
-Sharpie, pen, pencil, and notepad! Have these on you always. Take notes!
-A bag for all of it
-Good boots
Eventually consider getting:
-A set of ratcheting wrenches in SAE
-An SAE socket set with ratchet, sockets, extensions, universal joint, and allens
-A full screwdriver set
-Drill, driver, sawzall unless you're planning on going the union route
-Hacksaw if you can't afford a sawzall
-A good multimeter
-Screw holding screwdrivers
-Rotosplit if you'll be using MC.
Personally I think that you shouldn't need to provide benders, fishtapes, or consumables especially since you're essentially working as a pre-apprentice.