Changing Drop Handlebars for Flat


I’m looking for some advice, I’ve got a Carrera Zelos Road Bike and I’m wanting to replace the drop handlebars with flat ones. I’m unsure what gear shifters and brake leavers to buy...

The front mech is a Shimano 2 speed, and Shimano 7 speed reach mech. (14 gears)
The gear shifters are Shimano STI trigger shifters.
Tektro Dual pivot caliper brakes.

Also, any recommendations for flat handlebars?

I’d really appreciate any help anyone can offer,

Many thanks,