don't dash attack, as it usually doesn't link to anything when playing competant players, IE: it can be DI'd out of O-so easy, and the trajectory it send your opponents is hard to combo with.
You should approch with lasers, and when you get to your opponent, these attacks are good for combo set ups: grab, dair, shine.
Some people will say uair, but i always get sheildgrabed so i don't use it.
You can go for a nair too, but that won't lead to any combo usually. Better at higher percents.
The usual responses you get when you SHL is your opponent will sheild, and attempt to sheild-grab you or they will jump over em.
Against sheilders, i normally shffl dair, waveshine, JC shine, JC shine, which leaves you in the air ready to combo if you hit them with any of the three. You might have to practice the basics before you do this, and make sure you start your dair as low as you can to reduce the chance of being sheild grabbed.
I do this as opposed to pillaring, because i think that pillaring is too easy to get sheild grabbed out of.
If they jump over you lasers, be quick and give them a solid sex kick.
And if your tourney has a cash prize, shout at the top of you lungs whenever you approach, scare the **** out of em, and knock off a stock before they realize what the hell happened.
Good luck