When you begin the game you will only have access to some very basic Blueprints. These are of Common rarity compared to the Rare, Epic or Masterpiece Blueprints which are unlocked by completing events like Faction Loyalty Challenges and unlocking the Champion of Tarsis, Stronghold Events or simply becoming skilled in other rundown activities. As you increase in Javelin level you will need to craft much better gear using these rarer Blueprints. One of the best ways to unlock Blueprints is reputation. In Anthem there are 3 different factions; Arcanist, Freelancer, and Sentinels and each of them offer different rewards for increasing your reputation. Reputation is earned through completing missions and contracts for each faction, performing certain activities and collecting certain treasure chests and nodes.
Arcanist Reputation:
Rewards give you access to better gun blueprints and the Arcanist Store.
Freelancer Reputation:
Rewards gives you access to ammo and Javelin Components.
Sentinels Reputation:
Rewards gives access to better gear blueprints.