Welcome to the forum....
I agree in that I also use Klien tools....I used to wear the pouch all day for my first couple of years....used to be a joke around here back in the 80's...you can always tell a rookie because he has every tool under the sun in his/her pouch and only end up using 3-4 of them a day.
When I am roughing in I only have my Linemans, Strippers and (2) screw drivers on a mini pouch made of leather also from Klien.
I was also one of the old school guys....strip my wire and NM jackets with my Linemans...until I got a Klien stripper with the built in NM stripper....now I would not be without it....makes it SOOOO easy and a neat job.
But starting out is where you should spend the money to get what you will need if you can afford it.....
1.) Nice Sidecutters - Klien again is my choice
2.) Nice Wire Strippers- One that does NM jackets and strips wire is NICE
3.) Screw Drivers- Small and Large head - Again Klien is my choice
4.) Additional Set of Screw Drivers - Smaller Trim Style.
5.) A nice set of channel locks- Never know when you need the grip..
6.) Wiggy Screwdriver- CAN'T live without mine...( bend shank design )
7.) Get you a nice Volt Meter....
8.) Personally...A nice complete Klien nutdriver set is great..I use mine..lol
9.) Oh...I also suggest a non-contact voltage tester...better safe than sorry...
10.) A good quality hammer....
also as someone else said...I also wear a nail apron with assortment of screws and so on...I have two actually..one for trim outs with 8/32's and 6/32's and so on...nuts and bolts...and I keep one for rough in's with staples, a few nail plates if needed and wire nuts....you get the picture...
AS for full tool belts- I was a leather guy for 15 years and then got one of those full wrap around tool belts with the back support made of that heavy nylon....made also by Klien...well I am never going back to the old leather " Stretch Marks" style toolbelt....love my Klien Full Belt...thehe..when I wear it...
Nice to wear it on a service all...you look important..thehehehe and they know why the bill is so high...to pay for those tools you are wearing..