I want new apple account and delete old one

You can create a new account but you can't currently delete accounts, and any content that you bought/downloaded via your existing account will remain tied to that account.

You can create an account via this page.

Settings/Store

However, that will affect only NEW purchases.

ALL purchases are permanently associated with whatever Apple ID was used to originally obtain them. Apps can not be updated without knowledge of that ID and, more importantly, its password. Apple IDs can not be merged and purchases can not be transferred from one ID to another.