Jon Finkel's prolific talents and sterling resume earned him the nickname "Jonny Magic" long ago. After a substantial hiatus, Jon Finkel returned to the Pro Tour and immediately demonstrated why he's widely considered the greatest player of all time by winning PT Kuala Lampur in 2008 and Top 8'ing PT Avacyn Restored and PT Dark Ascension in 2012.
Rather than opening up the spoiler every week to see what's new, Jon gets the best grasp on a new set simple by drafting it.
In Sealed you'll get powerful bombs that you really want to play but your deck will be less stream lined than in draft.
If there are two good black cards don't take a slightly worse red card because you "don't want to fight for black". Just pick the best card.
Having a team is critical to improving. Find the best players you can but make sure you get along with them personally because you'll be spending a lot of time with them.
Take advantage of draft simulators. Rebuild packs with friends so you can draft. Beg, borrow and use proxies if you're on a budget and need to test deck ideas.
Be critical of your plays so you can improve