Flash is one of the few champions to have a bit of a rough transition from Gotham Heights to Coast City. His early levels tend to be where he struggles the most as he doesn't start with the 1250 credit cushion like he did on the other map.

Levels 1-4: Whether you are jungling flash or laning with him, your first 4 levels are going to be the hardest. If you are in lane try to focus on getting credits safely, it's often better to miss some last hits and let the credits hit the ground and then use your Q to dash through to pick them up. This way you don't lose out on the early credits needed.

4 and 5: I usually go back to base at level 4 and purchase the first tier of the Scades Cane. I only worry about the first tier because it gives the passive for only 250 credits (every 4th auto attack you gain 50 power damage). I grab this, and if I have saved up enough I'll get the first tier of my Psi-Scimitar.

6: This is when Flash hit's the breaking point where he can truly start to carry on Coast City. In lane I like to open up with a Q into my enemy, immediately pressing E and W for the increased attack speed, power damage per hit as well as power and attack armor. His W is amazing at getting the scades proc up so you should try and Q again after you've gone in and used the W on an enemy. If this combo doesn't pick up the kill you can always press R for the easy clean up as you will have dashed back into the middle of the enemy after performing the combo.

7-18: Try farming and setting up picks where you can. Flash can use his ultimate to tower dive like a boss, simply start attacking them to gain tower aggro, ult for invulnerability and the tower will have switch aggro to your teammate, securing a kill and usually a clean get away. The amount of damage you are able to put out is also determined from how many Psi-Scimitar procs you are able to pick up. Each time you use a skill you should auto attack before using another skill. It will ensure the most dps, and often times means you can save your ultimate for when you really need it and not just to pick up a kill.

Flash is amazing at invading a team at Doomsday Device. He can jump the wall into the pit using his Q and can force an enemy team to drop the bomb on himself. If timed correctly you can ult and the Doomsday Device explosion won't touch you and you'll probably end up killing whoever sat in your ult during the pretty explosion.

It will take some practice to over come the early level hurdles, but as the fastest man in the universe it shouldn't be to hard to get where you need to go.