Hi LETNI321,
You can find answers to your questions at docs.altera.com ! In particular, there is the Altera FPGA Software Installation and Licensing guide:
https://docs.altera.com/r/docs/683472/26.1/altera-fpga-software-installation-and-licensing/answers-to-top-faqs
To get information about getting the Quartus Prime software.
Regarding the hardware, you can consider trying first the Power and Cost Optimized devices such Agilex 3, MAX 10 or Cyclone 10; and the devkits based on those devices, both from Altera or partner solutions.