Switching from MTB to road handlebars
You absolutely need SRAM shift/brake lever units. SRAM road shift/brake levers are compatible with their MTB derailleurs and come in a 1x11 version. 

Trying to mix Shimano and SRAM will just be a huge headache. I'm not even sure there is a shift cable pull converter for that.

Hydraulic vs mechanical calipers is up to you and your budget.

Something you should be aware of is that flat bar bike frames are typically longer than drop bar frames, because flat bars place the rider's hands closer to the head-tube than drop bar hoods or drops hand positions do. Check your bike's geometry to make sure you wont end up with too much reach.