Esta noche quiero pedir una pizza para cenar.

In Spanish, esta noche is the normal way to say tonight.

• esta = this
• noche = night

So literally it is this night, but idiomatically it means tonight.

Hoy noche is not the usual expression in standard Spanish. A learner should strongly prefer esta noche.

Because noche is a feminine noun in Spanish.

• este = masculine singular
• esta = feminine singular

So:

• este día = this day
• esta noche = this night / tonight

The demonstrative has to agree with the noun’s gender and number.

Spanish often drops subject pronouns when they are clear from the verb ending.

Here, quiero already tells you the subject is I:

• quiero = I want

So Esta noche quiero pedir una pizza para cenar is completely natural.

You can say Yo quiero..., but it usually adds emphasis, contrast, or clarity:

• Yo quiero pedir una pizza, pero él quiere cocinar.
  I want to order a pizza, but he wants to cook.

Without that special reason, leaving out yo sounds more natural.

After querer (to want), Spanish normally uses another verb in the infinitive.

Pattern:

• querer + infinitive

So:

• quiero pedir = I want to order
• quiero cenar = I want to have dinner
• quiero dormir = I want to sleep

This is very common and works much like English want to + verb.

Here pedir means to order.

More literally, pedir often means to ask for or to request, but in food contexts it is the standard verb for ordering:

• pedir una pizza = to order a pizza
• pedir una bebida = to order a drink

This is the most natural verb in Spain for ordering food from a restaurant or takeaway.

Usually, in Spain, pedir is the better and more natural choice for food.

• pedir una pizza = natural
• ordenar una pizza = understandable, but less natural in Spain for this meaning

In many contexts, ordenar more often means:

• to put in order
• to organize
• sometimes to command

So if you are talking about ordering food, pedir is the safer and more idiomatic option in Spain.

Spanish usually needs an article here.

• una pizza = a pizza

In English, we sometimes omit the article in certain food expressions, but in Spanish you would normally say:

• Quiero pedir una pizza.
• Voy a comer una pizza.

Leaving out una would sound incomplete in most normal situations.

Para cenar means for dinner in the sense of to have for dinner / in order to eat at dinner time.

It uses para + infinitive to express purpose:

• para cenar = to eat for dinner / for dinner
• literally: in order to dine

This is very natural in Spanish.

Para la cena is also possible, but it feels a bit more like for the dinner meal or for dinner as a noun phrase. In everyday speech, para cenar is often the more natural way to express the idea in this sentence.

Here para expresses purpose.

So:

• para cenar = for dinner / to have for dinner
• literally: in order to dine

It answers the question what for?

• Quiero pedir una pizza. ¿Para qué?
  Para cenar.

That is a very common use of para in Spanish.

Yes, Spanish word order is often more flexible than English.

The original sentence:

• Esta noche quiero pedir una pizza para cenar.

You could also say:

• Quiero pedir una pizza esta noche para cenar.

Both are correct. Starting with Esta noche simply puts the time expression first, which is very natural and often sounds like Tonight, I want to order a pizza for dinner.

So the original word order is normal, but it is not the only possible one.

Because after para, Spanish can use an infinitive directly.

• para cenar = to have dinner / for dinner
• para comer = to eat
• para descansar = to rest

So there is no extra word needed between para and cenar.

Yes, but the meaning changes slightly.

• quiero pedir una pizza = I want to order a pizza
• voy a pedir una pizza = I’m going to order a pizza

So:

• quiero focuses on desire/intention
• voy a focuses more on a planned future action

Both are natural, but they are not exactly the same.

Cenar is a verb meaning to have dinner / to eat dinner.

So in this sentence:

• para cenar = to have for dinner / for dinner

Related forms:

• la cena = dinner (noun)
• cenar = to have dinner (verb)

That distinction is useful:

• La cena está lista. = Dinner is ready.
• Vamos a cenar. = We’re going to have dinner.

It is completely natural in Spain.

Esta noche quiero pedir una pizza para cenar sounds like normal everyday Spanish. It is exactly the kind of sentence a native speaker might say when deciding what to eat.

The most Spain-friendly part is especially pedir una pizza, since pedir is the standard everyday verb for ordering food.