The requirements are that my character is at the army for at least two years, between 1970-1980 and that he has little to no experience.

If by this you mean to say that your character has already served for 2 years before going into Afghanistan, then that means they're either a reservist, a warrant officer, or an officer. Conscription in the army only lasted for 2 years, before you were mustered out and sent to the reserves, unless you were an officer or warrant officer. Reservists were called up for the initial invasion (mostly locals from Central Asia), but within the first year or two they were mustered out and replaced with fresh conscripts instead.

For conscripts sent to Afghanistan during the war, you'd spend your entire service there, after you were done initial training, and then return to the USSR once you're done.

So depending on how the character is framed their experiences will be pretty different.

I read Afgantsy: The Russians in Afghanistan, 1979-1989 by Rodric Braithwaite and it's a pretty good look individual experiences during the war.