Staging area where a player can walk around and use their abilities on dummies
Tutorial turret lane - turret fires practice darts (deal damage that is healed back quickly), minions are also going through lane
Fountain plushie at the end of the lane, "channels" in same way end game fountain is taken.
After staging area is a common practice area that has target dummies, turrets, minions running between spawn/despawn points to practice attacking, and other players.
Long term it would be fun to put other things in the practice room to allow fucking around between matches:
Short lived boxes can be spawned to redirect minions
Big baddies that can be attacked and will chase you around, smacking aside anybody that you and the baddie run past
Finally, a creative task!
New map needs to have the basic layout described in the game design doc - long lane, towers in the middle, and a base with a shop.
Off to the sides should also be some level geometry to give visual perspective as the player scrolls - cubes and spheres are fine. These are static.