How to get a computer placed good?

hello there

im sorry for my bad english

im having a problelm lately getting to sit comfy next to the computer

i ussaly used to play on it untill i got a good chair that is quite high

the problem is that on my desk the monitor is placed to low and i cant raise it higher with books because there is a book shelf above it and i dont wanna become a hunchback while playing everyday 1 hour a little bit bent down

and ive tried placing it in other places at the house but i cant use it with hands staying comfy and im getting numb on the hand

i feel like the finger and ring hands become like numby and i cant use the computer without getting my hands getting strained feeling

anyway i want to ask if you can give good advice how to place computer comfy or how to adjust it without getting a bad positions on the hands i meen and how not damage the hands with all kinds of this syndromes such as carpal or thingys because only on my desk in my room i can use it without starining my hands but i cant use it without the monitor being too much low and without bent down and on other places when ive tried to place the computer after an hour using it im feeling my arms starined