Buddy, you better go to the car service, where they will do it for you without any explanation, because here you have a lot of questions that are difficult to explain just like that. The only thing I can tell you is how to install smart light bulbs in the car interior and that's it. For such problems that you want to solve, there are car services where you pay and everything is done to you, thereby you save your strength, nerves and time, rather than asking a thousand questions on forums where nothing will really be clear to you. I wish you good luck to do all the work in the car service.