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Modals
In 
the introduction
, you learned that German has no helping verbs. Instead, they have 
modals
, words 
that basically do the same thing.
Modals are conjugated very differently from normal verbs. The ich- and er/sie/es-forms are always the 
same, while the du-form adds an 'st'. Most modals experience a vowel change from singular to plural, 
and the rest is the same.

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Möchten
Möchten isn't technically a modal, but it acts exactly the same. There is no vowel change, and the ich- 
and er/sie/es forms are "möchte". Here is the complete conjugation:
Person
Singular
Plural
1st
ich
möchte
wir
möchten
2nd
du
möchtest
ihr
möchtet
3rd
er/sie/es
möchte
sie
möchten
Möchten means "would like" and can be applied to food (i.e. Ich möchte einen Cheeseburger.). 
Möchten can be translated even more literally as "would like to", and is traditionally used with an 
infinitive verb at the end of the sentence (i.e. "Ich möchte jetz gehen"/"I would like to go now"). 
However, this infinitive is not neccesary if it's completely obvious what you're talking about (If you say 
"Ich möchte einen Cheeseburger", everyone will assume that you would like a cheeseburger to eat.)
(Note: Technically, "möchten" is not a word. The above cited conjugation is actually the "Konjunktiv" 
of "mögen", which has become so popular as a phrase, that even many Germans today aren't aware of it 
anymore, so you don't need to worry about it. "Etwas mögen" means "to like sth", and "I would like" is 
the closest translation of "ich möchte")
Wollen
Wollen is a true modal; it even changes vowels. Ich/er/sie/es will and du willst. Here is the complete 
conjugation:
Person
Singular
Plural