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I need to replace my nand on my iphone 6s plus i am going to attempt this my self wish me luck lol what i need to know is if i buy a new nand chip does it need to be flashed once i have put it in also if i take one off an iphone 6s i have will this work i am new to all this and always willing to learn so any advice would be greatly appreciated

The new NAND will have to be programmed. You cannot just swap NANDS even from another 6s plus. If you haven’t got a programmer the other way is to purchase one through aliexpress, you would need to give them the syscfg info (serial number, Wi-Fi Address etc.) from the original NAND and they will program it in for you so as you only have to solder it on.