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I can't really give you a guide on how to be a "pro" player. It's a thing that requires building your way up to it. Everything you learn along the way is what creates a pro. But I can tell you a few things to start paying attention to, to help you get there.

Anyone really needs to know this, not just pro level players, but some people don't really focus on this until somewhere during their advanced stage and forward.  The distance of the battlefield, and the distance that troops move upon the field, and the distance which ranged targets can shoot, are what make the battle happen. Having a good grasp of what's going on can change a loss to a win, and can make any win even greater due to proper tactical use of troops.

TROOP MOVEMENT

Understand what happens with the troops on the battlefield.

(I can't post this section outside the alliance because I didn't write it!
Just remember that troops and players move according to their speed: Cavs, then inf, then arch, then cats.
Please continue below:)

DAMAGE

What determines damage done to your opponent by your troops?

Speed - the order of who hits what first, (190 is max possible)

Attack,

Lucky doubles.

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When sizing up the fight, you must consider both the length of the fighting field, and the shooting/attacking range of your fighters versus theirs... not to mention any turrets a defender may have, if you're the attacker. So you'll want to know some facts before diving in head first!

So much on this game is based off who gets 1st strike. The determining values for this are:
  Range - Speed - Defender Advantage

If you out range your opponent you get 1st strike

If you have more speed and the same range you get 1st strike

If you and your opponent have same range and speed the defender gets 1st strike

But how can you tell what your opponents range is?

FIELD RANGE

The field length is determined by range. Add 300 to whatever unit has the longest range (normally cats but can be turrets or archers also), and that is the field length. So, for an easy formula:

battlefield length = unit with the highest range on the field + 300

After a battle is initiated, you can click on any one of your troop types to see the effective field length.  

People use battlefield length to determine how far they can move before being hit. Then they calculate their own range, and speed. So if your speed is 149, you can move 2 times before being hit (because there is a distance of 300 before coming into range.) After that, range plays a big part in who loses the most.

Use this example. 

A catapult's range is only 800 in the fight. Add the additional 300 points to calculate the field length. So here, the field length is 1100.

so if your turrets are 1350 range.... then the turrets still have the farther range.  So once you move your cats, the turrets have you before you have them.

Now, you know how to calculate your range.

SHOOTING RANGE

To determine shooting distance, take the distance of the field then subtract 300.  Level ten tech shooting with catapults will give you a 1260 field length, -300 means the cats can shoot 960, and lvl 10 turrets can shoot 1050. 

1360 is the max field length, and only happens when level 10 turrets are present. 1260 is the field length when max tech cats have the longest range on the field.

Now use these tables to guide you.

Catapults:

Shooting range   Level

1100                 0

1116                 1

1132                 2

1148                 3

1164                 4

1180                 5

1196                 6

1212                 7

1228                 8

1244                 9

1260                 10

Turrets:

1300                 Lvl 9 turrets

1350                 Lvl 10 turrets