Okay now, Let me explain something quickly. Using someone elses Runes, Masteries, and Build should only be TEMPORARY.
After you get used to the champ, See if you like to play Shyvana Tanky or Offense, then decide to build the masteries depending on how you play.
For example I used to think going 9/21 Was best for me with Trundle in the top lane, But it turns out i'm better going 21/9 with Trundle cause I LOVE to fight as him.
So, My recommended guide for Shyvana is
Start
, a
and a
Vs. AD Usually
and a lifesteal item would work great.
VS AP Usually
and once again, a lifesteal item.
Against many mages you should probably get a
or a
Against Autoattack Ad's
or multiple Ad's 
If the enemy mages don't have a escape move (Like
or
) you could take something like
Or if they do have a escape, but not a very drastic changing one like
E
you could get
to slow them and keep attacking.
Shyvana also gets a pretty large amount of defensive stats,
usually is a good item on her as well
I recommend 9/21/0 Masteries.
Champs you can win against easy: 
Champs you will struggle with:
Summoner: Always
If you want to get fed, and snowball
Help the team
If you think your gonna lose lane:
If you think you will definitely get fed 