In my opinion:
On a hacked new 3DS XL if you have one:
Play Blazing Sword
Then play the project Naga translation of Binding Blade
Then play Sacred Stones on Hard Mode
Then play the Project Naga translations of Geneaology of the Holy War and Thracia 776
Then play the fan translation of FE12
Then play Three Houses

Then you can play the rest of the games as you like desu as they are all the least accessible for one reason or another (plot, gameplay, etc).