Take It Easy has quite a specific rhythm for the intro part. You’ll need to listen to the original a load of times to get it right. The first upstroke is before the bar starts.
U D D U D U
The verses are simpler
1 + 2 + 3 + 4 +
D D U D U D U
For Peaceful EF
1 + 2 + 3 + 4 +
D D D U D U
Don’t get too hung up on strumming patterns. Unless a song has a very specific pattern (like the TIE intro) many patterns like ‘old faithful’ will work. The key thing is keep your rhythm steady and perhaps mix the pattern up a bit for the chorus for example to stop the whole thing becoming repetitive. Although again, some songs rely on the repetitiveness for effect. There is no hard and fast rule.
Make the song your own. 
Edit. Sorry if the formatting isn’t great. Hope you can follow it. If not ask again.
Justin also has a lesson here