You don’t get a huge amount of grammar in the early seasons, so it’s possible you may not be up to reading a lot of things. Your best bet could be to make anki decks or flash cards and use them to reinforce what you know.
If you do feel up for a challenge, though, you could try reading stories intended for small children. Here’s one example:
http://hukumusume.com/douwa/0_6/index.html
You may find yourself spending a lot of time with a dictionary to read these, though – there’s probably a lot more vocab than you’ve learnt so far. Acutally, glancing at one or two, there may even be vocab that I’ve not even learnt. =P It’s also got audio recordings of the stories.