I can't remove my old iPhone 5s from "Find My iPhone" so it's essential unsaleable. There's that plus any apps/tunes/other items you have on your account may vanish.
I suggest you think long and hard about this.
I now feel the need to shift to a new Apple ID. I've been using the same email for buying stuff online, paying utilities etc. and also for the Apple ID.
I have now created a new email that I would like to keep only for syncing my iPhone contacts to the Gmail address, and working as my Apple ID.
What are the risk in changing to a new Apple ID?
Any reason why you will suggest against doing this?
I don't have any data in iCloud.
In case, I do change to a new ID, is there a sequence I should follow while signing out of my iPhone and Mac?