If I have an iphone and ipod, do I have to make two separate itunes accounts?

I own the old ipod nano and i have an itunes account with itunes downloaded on my laptop. I'm hoping to buy an iphone soon, but will buying an iphone mean i can link my ipod itunes with my iphone? Or do i have to make a whole new itunes account?

If anybody has been in this situation or knows how everything works that would be great!

I have an iPod and iPhone and one account so you'll be fine.

All iPhones/iPads/iPods ect use the same software - iTunes - and so all have access to the same account, as long as you have your username and password, of course.

No. If you want something to download which you have already purchased on another device go onto iTunes. Then go to "Purchased", select which thing you want-Music, Films or TV Series and there will be a cloud icon with an arrow(iCloud) which, when you press it, will start downloading the item onto your device