Hi Ayce47,
Welcome to ETO. I see you are from Romania.
What you want to do is quite simple in technical terms. The hardware would be low cost and off-the-shelf, apart from the mechanics for controlling your particular curtains. Probably you best source would be ebay and the software would be simple too. But as you say that you have no experience in this area you would have a great deal to learn. If you view this project as mechanism for learning that is fine but if you are hoping to quickly get a curtain control system going quickly, I'm afraid that would not be feasible.
OK, that is the lecture over, so this is how I would suggest that you would realise a curtain control system.
Hardware
(1) Arduino microcontroller board
(2) Bridge motor driver shield (input output board in general terms)
(3) DC motor geared down
(4) USB to mini USB cable
(5) Power supply 5V at 5A say but maybe 12V
Software
(1) Arduino Integrated development environment (free to download from the net) and run on your PC
System Configuration
(1) Connect the power supply to the motor driver shield.
(2) Connect the Arduino to a PC with the USB cable.
(3) Plug the motor driver shield into the Arduino.
(4) Connect the outputs from the motor driver shield to the motor with a cable
Writing Sketch (Arduino talk for program)
Just write the program in the IDE to control the motor, including direction.
Download the program into the Arduino.
(Don't be discouraged by the thought of writing a program- it is dead easy, especially if you are computer literate. Also there are many books and tutorials on the net to help you.)
And you are done.
Of course, you would have to design/construct a mechanism to allow the motor to control the curtains and that is probably the most difficult part.
You could also consider controlling the motor/curtains, rather than from your PC, but via a human interface to the Arduino- push buttons or touch screen for example. All of this would be pretty straight forward, when you are experienced that is.
spec
PS: if you just want a curtain opening and closing system best to buy one.
LINKS
(1) Arduno Home:
https://www.arduino.cc/
(2) Arduino Uno:**broken link removed**
(3) Motor driver (just illustration- not necessarily optimum for your application):**broken link removed**
https://www.ebay.co.uk/itm/12V-36V-...244880?hash=item211ab8e210:g:XP4AAOSwNSxVXny8
(4) Power supply: **broken link removed**