So i really want to start watching this

I would always start with season 1. The seasons built up on each other and 你 would often not get the joke 或者 story if 你 skipped episodes.
Another advice: Don't 谷歌 anything anymore about the show! ;)
The 显示 lives on their twist and 你 could get easily spoiled with unwanted information.
For the quick catch up: as soon as the 显示 gets you, 你 won't be able to stop so 你 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 你 will get there.

I don't think there'd be anything 你 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. 邪恶力量 is a good 显示 and I promise 你 won't forget it (I can't promise 你 won't get your 心 broken though) Anyways I would really start with Season 1 because if 你 watch it from the beginning as the storylines go on, 你 really understand the whole show, and the relationship between the two brothers, their personalities, and their backgrounds. Then that way 你 get to kind of fall in 爱情 with the story and the characters. You'll laugh, you'll cry, you'll scream, that's how good this 显示 really is and that's how emotionally involving this 显示 is. So until 邪恶力量 shows the rest of the seasons, I urge 你 to start like right now!! All 8 of the seasons are really good, and 你 gotta catch up on the first half of season 9 while CW has the episodes online. 你 have time though so take your time through it, but I promise it's worth it!!! :D

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