here's my 1st attempt at speed running this game

It's so laggy o.O

What emulator are you using for this? Holy smokes that frame rate is bad. It shouldn't be getting that bad until Float Islands.

BUT- good starting ground :) I would say get through the game consistently as your first goal. do like.. how fast can I beat this game with no strats at all. then once you get consistent do like.. complete x runs without dying, then complete x runs doing y goal,so forth and so forth. This allows for stepping stones to learning this game and reduces the amount of discouragement when trying to go for a good time :)

We all started at the same point you're at right now, remember that when you're looking at those top times. Keep it up!