Hi,
You can make use of the Favourites/Frequently Used part of the process.
2 ways to do that.
In Messages create a New Message to go to your iPhone. Then send yourself various items that you think you might use like the Flag your your country, the most used Smilies and so on.
Or in any Finder window go to the Edit Menu and select Emoji and Symbols
Select Emoji in the list in the Character pane. Find the ones you want and then use the Add to Favourites button (it's on the right)
7:29 pm Wednesday; November 14, 2018
iMac 2.5Ghz i5 2011 (Sierra)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
MacBookPro 15" 2016 (High Sierra 10.13.x)
Mac OS X (10.6.8),
iPhone 6 iOS 11.x and an iPad (2)