Also, keep in mind how disruptive Cloud and Bayo were to the competitve scene months and months after release. So much that they neutered Sheik and Diddy pretty hard even after Diddy's Hoo Hah neutering. Joker may upend everything we know come April.
Lucina and Mario are probably the best characters to get a feel for how the game's physics and mechanics work. After that, fool around with some different types (like Young/Toon Link for projectile characters, Bowser for a heavy, Marth/Shulk for a sword user, etc) and start to go with what feels intuitive.
I was a Sheik main forever heading into Smash 4. Started playing Toon Link on a whim and it just felt WAY more natural to me and I have not looked back. Just playing around with each character for a little bit on the test stage will give you a good idea what feels 'right'. And don't feel bad about choosing a 'lower tier' character as your main - Toon Link was a solid mid tier in Smash 4 but was also the hard counter to both Cloud and Bayo on a lot of respects.
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