Somehow I ended up on your site, reading your profile. I love your welcoming message and good wishes for these "hard" times we are going through.
I am always amazed to find so many young people at this site, taking advantage of all the opportunities that the computer age has to offer. In this respect, you all are very lucky. On the other hand, there is a huge problem to solve in keeping the planet livable and assuring you and YOUR children a future in it. Although personally I am not a Greta fan, but nevertheless, all things considered, her heart and mind are in the right place and she deserves admiration for her crusade and her achievement at such a young age.
As for you designs, you have a good grip on it already, and with a little study of other people's designs or interior design in general, (there are all kinds of lectures on interior design on the Internet) you will reach whatever goal you are striving for. I wish you lots of luck and a great future.