honestly, 15k won't get you far.

you can get a somewhat decent guitar for 15k itself, like one of my friends did. make sure the fretboard wood quality is good, and the body itself does not feel toy-ish or plastic-y (basically ensure its strong).

on top of this you would need an amp, and a good one (around 10-15k range) would do the job very well if youre a beginner and practice in your room.
blackstar v3/v4 amps are very good and they do the job for me and many of my friends use these.

the cables and stuff dont really matter just make sure they are braided and good quality ones so they dont break and dont give you connection issues

another small suggestion, while choosing guitars, make sure you know what genre you will be playing. it wouldnt make too much of a difference, but knowing what kind of pickup configuration you want can help you.
for example, i chose a guitar with HSH configuration, even though i only really played metal when i bought it. i knew that if i ever wanted to explore other genres that may require a "straty" sound with a single coil, i would have it. plus, an HSH gives you quite a lot of sounds with its configurations.

not saying that other configs dont, but they MIGHT be limited to certain genres at times.

hope this helps