I want commend you on the video. Great job. Next video be sure when you do the pre ride walk around to high light the shift kit and explain it. I'm so very proud of you for coming to complete stops at stop signs.
A couple of suggestions I have is to get a techometer. This way you aren't in to high of a gear that puts the engine and transmission under a strain.
Next consider building a 4 speed freewheel. This will reduce the amount of lateral stress on the chain from cross chaining. It'll also give you bigger jumps between the gears. Get a 6 speed freewheel woth a lock ring for the 2 stage core. Then put sprockets (28,22,18,14) on it. After that all you'll have to do is set the high limiter screw on the rear derailleur so it won't shift past 4.