Tips & Help with Radio Conversion

Hello my name is Antje, I bought me a Opel omega MV6 Bj 1995 a few weeks ago and am satisfied with only two little things but here I need professional advice. Would the radio like to replace with a new one and there I have heard really terrible things!?! So the old radio was a basic and the new one is the blue point DAB-53, ask the professionals for advice. By the way, with the old radio the date on the board computer has always disappeared and you had to always the Zün Can you handle it??? Need a woman-friendly explanation because I’ll try it for the first time! Then I’d like to replace the series boxes with others what can I recommend which system and what do I have to observe, what is recommended for this vehicle! Thanks, Antje