I know there are already many good beginner guides here but the thing that makes this guide different is the fact that my main focus point is the beginning of the game (levels 1-7).
Let's start with the basics:
A good start is really important, especially for Free-To-Play players, because without an early advantage you will get destroyed by big spenders. If you follow this guide properly, you will start your game with a solid 4 star hero and enough energy to reach level 30 on day one. Doesn't that sound wonderful? And the best part is you don't have to spend a single cent. You just need patience. Lots of it. This guide is divided into 3 phases, so let's start with phase 1: First Chromium Pull
Phase 1: First Chromium Pull
If you didn't know already, the first chromium pack you buy is almost always a full hero. We, of course, want to take advantage of this, so what you want to do in the beginning is to collect 350 crystals and then buy a single chromium pack. If the hero you receive is a bad one(only 2 stars or less), I suggest you re-roll and start a new account. I personally would continue rerolling until you get a good 4 star hero because it will help you tremendously. This might take a while (for me it takes usually 10 rerolls or so) but I guarantee that it is worth it.
When collecting crystals, just make sure your player level stays under 8. I repeat, DO NOT REACH LEVEL 8. I will explain why in the next section. The easiest way to collect 350 crystals and stay under level 8 is to finish normal missions 1 & 2 and Hard mode 1. Then collect the crystals from the achievements and do one or two daily missions. That should get you 350 crystals.
Now let's move on to phase 2.
Phase 2: Hoarding
If you followed phase 1 instructions correctly you should now have a good 4 star hero and your player level is under 8. Now I will explain why it is vital that you are not level 8. When you reach level 8, the game will automatically put you in an arena shard with all the other level 8 players. We do not want that to happen just yet because we need more time to prepare.
By preparation, I mean hoarding energy and items. You get free energy 3 times a day for a total of 135 points, so I suggest you hoard energy for at least 10 days. If you collect the free energy every day for 10 days, you will get a total of 1350 points and that is enough to reach level 30 in one day. In addition to energy, you can also hoard item shipments, free bronzium packs (you get 5 free ones every day) and daily login bonuses. I suggest you get them all in order to receive a big advantage.
After you finish your preparation, it's time to move on to the last phase.
Phase 3: Arena Here We Come!
You are almost done! If you completed phases 1 & 2, you should now have a 4 star hero, enough energy to reach level 30 in one day and dozens of useful items from free bronziums and from login bonuses. Now we just need to make sure that the arena shard you join is new and not a day old. Each arena shard consists of 20 000 players and they usually fill up in a couple days so in the best scenario you join the arena shard right after it is created and get to be in the top 100 right away. If you manage to do that you will save up a lot of crystals and get those sweet arena rank prizes straight away. You can quickly check whether the arena shard is new or old by creating a new account and leveling it to level 8.
I hope this guide was helpful for people who are planning to start a fresh account. This strategy definitely helped me to dominate my arena shard as a 100% Free-to-Play player and made the game much more enjoyable. If you have any questions, ask away!