I am sorry for commenting here in English but I am using this as the reverse course because there is no Czech for English course. Why is Ctu correct? (typing from an American keyboard which makes me unable to do the accent mark there so I am sorry about that) and what are the Czech verb conjugations (explain it to me like I'm a five year old)?
Ctu (i do have the accents but am too lazy to switch to Czech keyboard) is correct, because you do not need to use pronouns in czech with verbs. The conjugation already tells you, who it is that is doing whatever the verb makes them to do. You can use them, but you usually do not have to and in spoken language they are rarely used, unlike in English. There are several groups of verbs (i graduated from elementary school very long time ago and do not remember how many) and they all conjugate by it's primary verb.
In infinitiv 'to read' is 'číst
Let's stick to present tense for now.
I read - já čtu You read - ty čteš He-she-it reads - on-ona-ono čte
we read - my čteme you read - vy čtete they read - oni čtou
you and you is just like in French formal and informal and follows the same pattern as french.
I'll just expand a bit on what kacenka said about dropping pronouns, since this is something that I'm sure we'll have deal with when we eventually start work on the reverse course. Subject pronouns are generally not used unless there is a reason to use them. When they are used it is generally for one of three reasons:
Resolving ambiguity. For example "on čte" = "he reads" vs "ona čte" = "she reads". But even in these cases you would generally only use the pronoun if the gender of the subject is not obvious from context and is relevant. If it's obvious who you're talking about or if it's not really relevant whether the person you're talking about is male or female then you would simply say "čte".
Word order. This is a nightmare. You might want to ignore this one for now, but I'll write at least some of the details anyway. It may start to make more sense once you get a bit farther into the course. Czech word order is fairly flexible, but some words prefer to be in certain positions. For example, conjugated forms of the verb "byt" = "to be" like to be in the second position. Sometimes, when they would otherwise find themselves at the beginning of sentence, a subject pronoun will be inserted at the beginning to shift the verb into its preferred position. This isn't an issue with the verb "číst" in the present tense, because "číst" doesn't care about its position. It is an issue in the past tense, where your main options for "I read the book" would be "Četla jsem tu knihu", "Tu knihu jsem četla", "Já jsem tu knihu četla" and "Já jsem četla tu knihu". In the last two versions the "Já" is there just to push the "jsem" into the second position. If you're male then you would replace "četla" with "četl".
Emphasis. Generally, if a pronoun isn't being used for either of the two previous reasons then it will be interpreted as emphatic. So "Já čtu" will be interpreted as emphasising the fact that I am the one reading. You would use it, for example, in the following situation: You're sitting in a class where you're all meant to be reading and the teacher accuses the group of you of not reading. If you wanted to defend yourself from that accusation while subtly snitching on your classmates, who really weren't reading, then you would say "Já čtu".