Bro, there are too many aspects on futsal that you could spend time horning your skills on:
Techniques:
Dribbling - takes creativity. Either you have it, or not. Some dribblers are inherently better than others. The key is quick (and unpredictable) turns with ball close to your control, and body feinting. Also known as dummy. Nuke & Arsenal62 epitomise the dribbling skills.
Touches, Ball Control - trapping, and dragging. Trapping - as in cushioning the ball when it is passed to you in any ways (with ankles, thigh, chest) - is required for both 11-a-side soccer and street soccer. But because of the small area (relatively close opponent), it is a more crucial skillset than anything on court. Dragging - using your sole to control/drag/dribble the ball - is one of the most important skillset on the futsal court. Totoseow and bmwf1 can show you this.
Shielding - always putting yourself between the opponent and the ball in tight situations. You need no size to be able to perfect this. But often, it the the mindset that makes players turn to face opponents too fast, instead of shielding the ball. Hellfire and Arsenal62 are 2 of the best shielders of the ball.
Running - not running blindly, but running into opening positions. As in 11-a-side soccer, you will also wanna pass the ball to someone unmarked, or in a favourable position to either launch an attack, or distribute from deep. That means you need to make yourself a favourable recipient of the ball. Even if a defender is smelling your ass, your running will pull him along, creating gaps for others to penetrate and run through. One of the most important aspect in futsal, since with a smaller playing area, active and relentless running around makes you and your teammates interact and faciliate fast and short passing, or which defending opponents are harder to track and man-mark.
Passing - basic skill. Getting the ball to where you wanted it to go, with the appropriate strength - not too hard, not too soft. If the pass is perfect, your teammate might not even need to trap the ball. He could turn or pass or even shoot immediately. Many players are good passers here, but not many are good runners.
And finally, the mentality of interative futsal. Often, we get so fixated with EPL that we think we add value by standing at the corners, playing as a winger to facilitate passing. Actually that means the distributor has one option short. Very passive play. The best futsal team (Brazil) have 5 players (including goalie) criss-crossing one another and doing all sorts of running that makes their 4 runners look like 7 or 8. You can never ever man-mark a team like that. This active running is the best futsal mentality of all. Not fixed position, no fixated strategy. Very dynamic.