You're too sloooooow~~~
If Ike was fast, as his problems would be over, lawl.
1st off, learn to fair correcting and to abuse the IASA frames to jab.
2nd learn to love nair, for it auto cancels, and its Ike's only true combo to either jab, bair, or grab.
3rd, never use forward smash until you are good with Ike. Its a mind game for moderate Ikes, not starting out ones, so rely on tilts for kills.
4th. You'll need to learn to use bair. OoS do a SH bair. And RAR bair. Run off bair from platforms.
5th. QD can be used, but its a moderately skilled Ike tactic, newbies should concentrate on Nair, Fair, jab, grab, and bair usage.
6th. basic Jab combos: Jab cancel to jab, grab, tilts, or down smash.
7th. Recovery is one of Ike's bad points, so Learn to one peak aether (Having the tip of aether at the ledge), also learn to predict how the opponent plans to edge guard you. Keep in mind, QD isn't great to recovery with unless its a good mind game.
8th. Do not use dair when coming down, you'll get punished easily. In fact, avoid ALL unessessary laggy moves. Use a quicker move when you have a choice.
9th. Nair, Nair, Nair, does wonders against air dodgers and great for chasing rollers.
Try to work on those 9 things.