Question

I just bought my first amplifier (a blackstar ID:Core amp)

Im trying to record my electric/acoustic guitar but when i make a track and have to choose an input, there´s no option for me to choose the amplifier, so my computer just records the sound instead

My options on the input selections are either Input L or Input R

Answer 1

How did you expect the audio from your guitar amp to reach Studio One? By magic?

You have a long way to go to learn how recording works.

Watch some videos on YouTube to learn the basics.