As an action, you can manifest any weapon you are proficient with into your hand(s), if you create a ranged weapon you gain one quiver/clip/magazine, the weapon lasts for 1 minute (10 rounds) you can do this a number of times equal to your proficiency bonus per day, the weapon is considered magical.

At 10th level the weapon lasts for 5 minutes (50 rounds) and is considered a +1 magic weapon

At 15th level the weapon is considered a +2 magic weapon and deals an extra dice of damage 

At 20th level the weapon lasts until dispelled, is considered a +3 magic weapon and deals 2 extra damage die.

Additionally at 20th level, your can create up to 10 weapons Which you can telekinetically control but they can't leave a 10ft radius of you and can't be used to block or defend, they also can't be ranged weapons, be two handed, or heavy. If your DM allows, you can control other creatures weapons to give them advantage or disadvantage to attacks