In English the word ‘informations‘ does not exist. So if you want to say that you need ‘Informationen’, you would say that you need ‘information’!
The word ‘information’ is an uncountable noun (like ‘furniture’ which we had some time ago). There isn’t a plural form of it. So you can’t say “I don’t have enough informations to make a decision”. You should say: “I don’t have enough information to make a decision”.
You also can’t say “That was an interesting information”. You can either say: “That was interesting information” or “That was an interesting piece of information”.