Helpful buys for a Newbie?

Hello dear ones, I am very fresh here and that only because I intend to exchange my 10 year old Dacia Logan (but drive him for only 3 years) for an Opel Adam from August onwards. Have the upgrade quite necessary and therefore want to inform me in advance, what should be taken into account when buying everything in the hope that someone of you is so nice and can tell of himself Kurz to my ideas: it should be an adam in berry red, preferably with white roof. ung, mp3/usb-port and navi are a must, about everything else can be argued. Have a few vehicles in the visier and will visit the car houses in the beginning/mid juli times. What can you give me as tips about buying? What do I have to pay attention to at the opel? Greet love and thank you for your answers!