@ouznini 16kg is perfectly fine for someone your size who hasn't done weight training before. Depending on how you react to training you may need to go up to 20 soon-ish, but you don't know that until you try and it's always good to have lower weights around.
If you can afford it, get an...
@googs I think you're getting confused with the SAID principle. GAS just describes how you temporarily get worse before you get better, plus it's being called into question a lot recently