Newly used NC has a few quirks and newbie needs help

Hi together, I got myself a 2011 NC, but after the purchase have to find out that he has such a few quirks, can you give me there a few tips how I can fix the best? Have little screwdriver experience, but would like to learn if it is possible. Do not have any tools yet. The exact model is a 2011 NC with 2.0 liter motor, 6 gear manual transmission and DVD radio with AUX, but without Bluetooth. The biggest problem is the climate that works though, smell The other problem is that the radio doesn’t have a reception, but speakers and all the buttons work. Would be very grateful for tips and maybe even instructions on how to fix the problems, was probably too hasty and too full of anticipation than I did the short test drive. Is there any other things I should check, or would you rather look for a workshop that might look for it? But it would be nice if there is one that is transparent and explains things instead of trying to get the maximum money out. Many greetings and thanks from a newcomer