I depends on your daily life and your "likes", in my case as i have little children i started watching basic cartoons very easy to undertand like "peppa pig" or " Ben and Holly", after that you can increase the level with other cartoons, like disney ones, in which they speak at a normal pace. In respect to subtitles, when it's the first time i watch a movie I set it in english, if i watch it again in spanish so i have to make an effort to "catch" the word, finally if third time, with no subtitles.... Hope it helps you! ;)