Hi, I am BuesiVenoM.
The Vikings were the first Heroes i felt in love.
Here is my Main Build with my detailed explanation.
My favorite Maps are all three lanes Maps except Blackhearts Bay and Tomb of the Spider Queen on these Maps you have to collect Gems and Coins. Because TLV are very squishy you have to play very cautious.
I normaly try to soak hard until lvl 10 and then try to join the main fights.
If there is an Aba, you could stay on the lines until he used the Ultimate Evolution.

If the Maps have Camps which could be collected with 2 coins like Siege Camps, Viking Bribrery is your Option.
On other Maps you should Take Explosive Attacs for fast Lane-clearing.

Selfheling Baelog: This is in the later fights very useful, if baelog has less heal, go to a lane and heal him up.

Spin to the wind becomes extremly effective on lvl 16.
When Olaf stuns an enemy, surround the enemy with all Vikings and spin him down.

I always took Play again here. You cold play more agressive and then get back into the game instantly.
Until now, you should join all fights.

Jump is the best talent ever, if you Play vs a Hero which can stun you. Try to hit jump before he wants to stun you and then survive. This is a MUST talent vs KT. You could deny all living bombs.

With Block here you could stun enemies, surround them and Spin them down.
Also in fights, you could stun an escaping enemy which is very helpful.

I always take Fury of the Storm to give additional damage.