Apologies for such a belated answer, but I would advise you to steer clear of Tinkercad. It is fairly limited in what it can do, and the skills you acquire there don’t really transfer to more advanced CAD software. If I were you, I’d start in Fusion 360, even though I don’t like it and use FreeCAD myself, because it’s beginner friendly and there are a lot of tutorials on how to use it and for what. I would also advise you to start with something simple, like a hook for example. It is a fairly steep learning curve, and there are quirks if you are making something for 3D printing specifically. If you want more info, don’t be afraid to DM me, I’ll try to set you on the right path. Cheers!
Apologies for such a belated answer, but I would advise you to steer clear of Tinkercad. It is fairly limited in what it can do, and the skills you acquire there don’t really transfer to more advanced CAD software. If I were you, I’d start in Fusion 360, even though I don’t like it and use FreeCAD myself, because it’s beginner friendly and there are a lot of tutorials on how to use it and for what. I would also advise you to start with something simple, like a hook for example. It is a fairly steep learning curve, and there are quirks if you are making something for 3D printing specifically. If you want more info, don’t be afraid to DM me, I’ll try to set you on the right path. Cheers!