ss13 is right, He could easily start a business and use polish/english people to run the store and customer support.
It depends on what he wants to do. From the sounds of things, he wants to set up a small company - in which case, it's pointless if he can't communicate.
If i was a client and need IT help, i would look for quick cheap and good repiars, using parts that wont die in a week or of low parameters then what i had.
No no no. This is what's wrong with the entire IT repair/sevice industry in Poland - people promise quick, cheap repairs and then can't deliver. It's far more important to deliver on what you promise - if you tell someone "two weeks, guaranteed, or you pay nothing" - then you'll get business. It's also incredibly difficult to use good parts and yet a cheap price.
And you should treat me like a computer is an alien ;)
NO. This is the other big problem in Poland - treating the customer like an idiot. The 'specialist' IT sales places are absolutely dreadful for this - and they're always prone to sulking if you walk in (especially if you're female!) and tell them exactly what you want.
I think your best market would be quick fixes and data loss recoveries, these people need the most. and some home to home setup help or course for a fee.
And for this, he'll need Polish.
Incidentally, there's no money in quick fixes. Everyone and their dog is doing this in Poland - if he's got the money, then it makes sense to go into more high end things - such as guaranteed 24 hour repairs and so on for businesses where time is money. There's just no point trying to compete with people who will work for 5zl an hour.