when i try to download an app, it says my apple id has never been used in the app store and i need to review by putting apple id and password but it only has one line and when i fill it in it says its the wrong password or apple id so what do i n id

The resolution to this issue is often making sure you have entered a credit card or other valid method of payment* even if you don't plan on needing to use it. The document 'If you can't remove your last payment method or use no payment method with your Apple ID' mentions "if you're using an existing Apple ID with the App Store for the first time, you must provide payment information," in this link: https://support.apple.com/HT203905

If there is an option to select "Review" or "Continue", select that and enter valid payment information if required. If there's problems doing this:

Tap: Settings > [your name at the top] > Media & Purchases > View Account > Review Apple ID.

More things to try in this 2018 post by Urquhart1244 marked Apple Recommended:

https://discussions.apple.com/thread/8434425?answerId=33542414022#33542414022

If you continue to have problems contact Official Apple Support - Select your region from the list and then your country from the pop-up window. If you do not see your country, see if there is an "other" listing for that region.

https://getsupport.apple.com/?caller=cups&PGF=PGF63005

*Payment methods that you can use with your Apple ID - https://support.apple.com/HT202631

Try signing out of the App Store/iTunes, restart, and then sign back in. Check the updates to see if the apps requiring an update/you are trying to download are in your Purchases History. If they aren't in your Purchases History, you can delete the app, and download it using your Apple ID if desired. If the apps are in your Purchases History, contact iTunes Support.

Purchase History Review

See the Apple Support articles below for contact information.   

iTunes Support – world wide 

Apple Support schedule phone call       

If necessary, try Twitter

https://twitter.com/AppleSupport.          

I am having apple IPhone, before few hours I have created apple ID but I am not able to down load any app on it. There is message that 'this apple ID has not yet been used in the itunes store. After giving click at Review window ask to enter apple ID & password in one block after entering the apple ID & password the next window says verification failed. My apple ID or password is incorrect. Please advise so that I can down load required apps on my iphone

It say my id have not been used

Same solution.