You would add "est-ce que," making it, "Est-ce que tu lis le journal?" Or, you would just replace the period with a question mark. If you do that, when speaking, you must say it like a question, just like English.
If you want to ask something like "When do you read?" There are a few ways to do it. Inversion: Quand lis-tu le journal? Question word at the end: Tu lis le journal quand? Using est-ce que (I'm not positive that I'm using this one right, or if it is even est-ce que.): Quand est-ce que tu lis le journal?
They do sound the same you know which it is whether it follows tu or il/elle. You have to learn each different ending following I, you, he, she etc. like English, I am, you are, they are, I read, you read, he reads. Lis and lit are different versions of the verb 'to read'. When following plurals (we, they, them) the endings are different again. Frustrating but there are some rules ( regular verbs) and seem that you just have to learn.