So, if like me, you have done some research you probably saw that getting the blueprints for the level 2 large buildings needs to be done at level 98.
This is true to a point. There are outpost quests you can do that allow you get a book that can be turned in for a specific blueprint.
I'm typing this quick from my phone so I may not get the spelling of names exactly right. someone can help me
1. Build the barracks - this one is obvious since you need the barracks for the bodyguard and it's built automatically at the start of your garrison
2. Get a follower with the bodyguard trait.
This is done easily by following the first quests to Ashran, finishing that little sequence and you get the caster follower Vivianne
You can do this early on to start leveling her on missions as well. You do not need to wait for level 94 for this
3. Continue to level to 94 as you normally want to
4. You will get a quest in your garrison to go to Talador
5. Take the flight path to Talador and do this specific quest chain
Continuing with the following quest series rewards a Comprehensive Outpost Construction Guide and follower Miall / Morketh Bladehowl. The quest series are relatively similar across factions:
The Quarry Quandary
In Ared's Memory/ Unleashed Steel
Out of Jovite
Iridium Recovery
Gas Guzzlers
Going to the Gordunni
Dropping Bombs
Supply Recovery, Prized Repossessions, Punching Through
The Lord of the Gordunni
The Only Way to Travel
6. Once you have this item, fly back to Ashran and exchange Comprehensive Outpost Construction Guide for Barracks Blueprints level 2
The vendor for this is standing by the flight path, a goblin dude
7. Learn the blueprint by clicking on it in your bags
8. Go back to your garrison and go into your architect plans
9. Click on the barracks and click upgrade
10. Once upgraded take the bodyguard follower and click the + to assign them to the barracks
11. Go back to your barracks and this new follower should be sitting out front
12. Click on them and chose "I need some muscle"
13. They will now follow you around