I know how overwhelmed you feel.
Building a pc for the first time it's hard,really hard.
I am sorry but,
It's really hard to criticize and discuss your build, as it is better to build another pc...
And anyway,
what are precisely the part that you are unsure about?
Looking at the cpu you choose...
Get a "K" one, because they are unlocked...
And about monitors....
I know you have a tight budget but a monitor is something you buy and then keep it for years...
That monitor,even at 90€, its a complete waste of money...
If you buy that monitor ,spending 90€ , you will be stuck with it...
What will you do next?
Feel buyer remorse?
Trash the monitor and waste 90€?
You want to know a real advice (for your situation,not in general)?
Buy something like d3sl91 suggested , with a nice IPS monitor, but without an OS and without the GPU (that's right!!).
Suffer ( a bit) 2 months, gain more money ,and Then buy the gpu.
You will have spent your money better.
Quality Gaming IS NOT cheap.
I dont suggest you rushing and wasting 900€ euros for games hype,
Just because you want to play some games NOW.
I hope I helped you.