starting a brand ??

so having my own fashion brand has been literally my dream since I was like 6 and now that I'm 19 and starting to consider actually having a go at it I want to know what you think are the most important parts to consider and any tips you can think of!

the goal would be a slow fashion brand- made to order pieces and mostly using dead stock fabrics so when it's gone it's gone I think it's such an interesting way to keep continuous interest and a bit of fun seeing what's next plus maybe like a couple base items that I would order fabric to keep them the same all the time if that makes sense? it would be a way to support slow fashion and sustainability by not letting those fabrics go to landfills

maybe you guys will bring me back down to earth lol and it's not a realistic idea but I think it would be so so cool and I've been thinking about it non stop for so long I just can't get the image out of my head