I have three statements to express "I want to go there." in German:
- Ich will dort hingehen.
- Ich will hingehen.
- Ich will dorthin gehen.
Which one is more accurate and formal and which one is more colloquial?
All three are possible with slightly different emphasis.
Ich will dort hingehen.
Here you emphasize the place where you want to go to. (Think of pointing at a map, saying "dort...". But of course this can be used in other situations as well.)
Ich will dorthin gehen.
Here you emphasize that you want to walk there (and not fahren/fliegen/....).
Ich will hingehen.
This would typically be used with some event and emphasizes that you want to take part in that event. For example: *Warst du schon beim Konzert von Rammstein? Noch nicht, aber ich will hingehen." This construction is similar to Ich will da hin. (which is less formal).