Been playing a mage (my only main ever) since I’ve started, which was right before the launch of TBC. These are second nature to me, what works for me might not for you. I mainly PvP so I strafe with A and D, even if you don’t PvP change strafe to A and D now and lose the keyboard turning, start turning with your mouse+right click.
My keybinds are setup for efficiency (to me). My number bar is mostly damage, with my index finger being the main actuator for the abilities I use 95% of the time to either damage, burst, or to stay alive.
I’m saying this because it isn’t a good idea to bind Icy Veins to “F” and frozen orb to “Q” when you’ll be doing those in succession usually.
I also don’t use shift modifier on the left side of where my fingers sit on WASD unless it’s
A. An ability that has a longer CD and/or is situational (such as Comet Storm and Blizzard)
B. Not important to my life or dps (such as Ice Block)
I can comfortably hit shift 1, 2, and Q because those fingers are extended out to hit the keys. I would never bind Ice Block to shift z because I would have to curl my fingers in hit the buttons.
s = shift
1 - Blink — s1 - Comet Storm
2 - Ice Nova — s2 - Flurry
3 - Frostbolt — s3 - Ray of Frost
4 - Ice Lance — s4 - Pet Nova
5 - Frost Nova — s5 - Cone of Cold
Q - Covenant — sQ - 2nd Covenant
E - Counterspell — sE - Counterspell focus
R - Icy Veins — sR - Frozen Orb
T - PvP Trinket — sT - Racial Ability
F - Ice Barrier — sF - Alter Time
Z - Remove Curse
C - Ice Block — sC - Cold Snap (I hit C with my index finger)
V - Polymorph — sV - Polymorph focus (I hit V with my thumb)
I have a lot more that I haven’t put here because I PvP, it’s mainly macros to specific arena frames. Also the other misc like food, healthstone, and mount. You’ll figure those out on your own (I use the F keys above the number row for these F1, F2, F3 etc)
Feel free to start small, but in my opinion you should focus your main abilities around your index finger. So maybe start with 1, 2, 3, 4, Q, E, R, and F + shift on all of those.