So i really want to start watching this

I would always start with season 1. The seasons built up on each other and あなた would often not get the joke または story if あなた skipped episodes.
Another advice: Don't Google anything anymore about the show! ;)
The 表示する lives on their twist and あなた could get easily spoiled with unwanted information.
For the quick catch up: as soon as the 表示する gets you, あなた won't be able to stop so あなた will really quick catch up. On good days I make one season in a 日 :P

Have fun with the show, it is the best <3

Start with Season 1 - isn't it always better to start at the start, and not skip anything? I know there's loads of catching up, but あなた will get there.

I don't think there'd be anything あなた need to know beforehand, the first episode explains the initial scenario well. It's not like the series is a spin-off of something else.

For Season 9 we already had our mid-season finale and we're on break till January 14th so we're a good deal into the season. スーパーナチュラル is a good 表示する and I promise あなた won't forget it (I can't promise あなた won't get your ハート, 心 broken though) Anyways I would really start with Season 1 because if あなた watch it from the beginning as the storylines go on, あなた really understand the whole show, and the relationship between the two brothers, their personalities, and their backgrounds. Then that way あなた get to kind of fall in 愛 with the story and the characters. You'll laugh, you'll cry, you'll scream, that's how good this 表示する really is and that's how emotionally involving this 表示する is. So until スーパーナチュラル shows the rest of the seasons, I urge あなた to start like right now!! All 8 of the seasons are really good, and あなた gotta catch up on the first half of season 9 while CW has the episodes online. あなた have time though so take your time through it, but I promise it's worth it!!! :D

This 表示する will take over your life. And it will cause much pain and tears but I promise it'll so be worth it. Best TV 表示する ever.