Hello, Josep!
There are graded books, such as novels or tales. Level 1 should be very easy to read. You can go to your local library or bookshop and ask. I am sure you will find as many as you wish.
You will find only basic words, and at times you may come across (= find) footnotes that explain the meaning of the most difficult words. The important thing is to think in English.
If you do not understand a word, do not look it up in your dictionary. Just underline it with a pencil. When you have finished reading the chapter, have a look at those words again, and try to guess their meanings. If you still do not know what they mean, then use your dictionary, and put their meanings next to them. Then, read the chapter again. This may imply more work, but I think it is worth the effort.
Best regards,
Polseguera
