Meaningful procedure and type of financing

Hello, I need the help of the community in order to become clearer in my project. I need a new car at the end of this year, my old one I have already sold. It is now to become a Golf 7 or a Seat Leon. As a purchase price about 16,000€ with the desired equipment and kilometers due. I do not have the necessary small money at present and would like to finance 6,000€. The purchase of a new car should not dissolve my complete reserves and should I have already looked at the Internet and have come across various offers. I am not interested in balloon financing or 3-way financing. I would like to cancel a loan over 600€ and then over 24 months a month. However, I have not yet decided on the “Finale” car. I am afraid that the good offer is already out of print until then I have the car loan f for this vehicle. Now to my actual question. Does the car (e.g. ING-DIBA) have to be already known about the vehicle, km and price, or can an estimate be entered here? Or should I prefer to take a loan without an end-use? I would like to have the money at home and can then react directly to a good offer and buy the car. How would you handle it? Thank you!