Learn Turkish: Yeni bir gitar almak istiyorum.

In Turkish, to say you want to do something, you put the action verb in its full dictionary form (the infinitive) first, followed by the conjugated form of istemek (to want). Here, almak (to buy) stays as an infinitive, and istiyorum (I want) takes the present continuous tense and the "I" ending.

Doesn't the verb almak usually mean "to take"?

Yes, almak is a very common verb that translates to both "to take" and "to buy". You can usually tell which one is meant from the context. Getting or "taking" a new guitar from a store naturally implies buying it!

Why is the word order yeni bir gitar instead of bir yeni gitar?

In Turkish, the word bir (a/an) always goes between the adjective and the noun. Instead of saying "a new guitar" like in English, you literally say "new a guitar" (yeni bir gitar). This is a strict rule when you are using an adjective to describe a non-specific noun.

Why doesn't the word gitar have an object ending attached to it?

Because it is a non-specific object. If you wanted to buy a specific guitar (like "the new guitar"), it would need a specific object ending (the accusative case). But since you just want to buy "a" new guitar (bir gitar), it stays in its bare dictionary without any endings.