Of course it's competing with Smash, but not because of the budget. They said that they want to do with platform fighters what LoL has done for MOBAs. That's extremely ambitious.
But I'm sure Nintendo had much more than $6 million behind Smash 4's development and marketing. Saying that $6 million somehow puts them in the same development league as Smash seems like a leap. Nintendo probably spent more than that on just the marketing budget.
You can search for local gatherings and go to those. There is a regional matchmaking section here, but you might be able to just google that. You'll be forced to play what they are playing though, which will probably require a PS4 or PC. You're not really going to get better playing against the CPU or your bothers(unless they start to take it seriously too), so it's either that or online play. I wouldn't recommend using wifi for online play either.
There is really no secret to picking up a new character quickly, but when you play against real, good player a lot, you get a pretty good idea for how characters are played. You can also study frame data to give you an idea of what is safe and unsafe. Obviously you can learn that through trial and error as well, but someone has already done that part and laid it all out for you.
The take away here should be that you really need to play against better players. And I would recommend looking into alternatives to wifi, such as an ethernet hub and a long cord, or a powerline adapter(never used it, but I hear it's better than wifi).