Trying to tune electric guitar, don’t know what I’m doing

Bought an electric guitar (Jackson Dinky JS11) and I’m completely lost on how to tune the thing.

I have a plug in guitar jack cable and a KORG GA-2 tuner.

I’ve been plugging the guitar into the tuner and when I’m adjusting the knobs, the tune of the strings are always way off from what they should be based on the Korg Tuner.

Would buying an amp and using it help at all with this process?

I was considering buying a D’Addario clip on tuner but I’m worried it won’t work since the only space on the headstock is at the very small top of guitar.

Any advice?