I'll relate my points to building a house.
The very first thing that has to be done after finding where you want to build your house is getting a good foundation for construction. For Smash, this comes in the form of universal techniques and overall intangibles. Specifically, you need to know what directional influence (DI) is and how to use it on a limited level, common situations that you think you'll be seeing often, knowledge of the buffering system (plus how to utilize it), and most importantly, simply knowing your way around a controller (ex.: Ftilt and utilt on command.) This is very general, but it's a start.
Then comes the framing. Doesn't look to pretty, but it's the skeleton that'll stay strong and be able to support things branching off of it. This step should be the step that you start getting some individuality in your play. (because not every house looks the same!) Learn how to mortarslide, simple b-reverse and wavebounce your C4 and grenades, JC grenade throw, and pivot grab. I can explain how to do each individual tech later, if you want.
This third step doesn't really translate into building a house, although I guess you could compare it to putting on siding and a roof to your frame. Those are the two things that are probably the most necessary parts of a house. ANYWAY. Gain experience and actively utilize everything you've learned so far. Through constant play (against other people, I'd hope), you'll see that DI, certain ATs, and buffering will start to become second nature to you. That's definitely good. And, through this constant play, you'll polish your overall game and gain very important experience with your character.
Final step is decorating the interior. This part is pretty far down the line. Expand your knowledge of the game, utilize newly discovered techs, become active on your character's board, etc etc.
I rambled a lot, but you should get some good info out of this.
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