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Question 1: How do I get into gidolan keep? Or maybe I can't?
You can't until a plug-in is created that allows access.
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Question 2: How high does my strength and dexterity need to be to beat a sea giant?
They are both at 38 with luck of 50 and I still get wiped out right
quick when I engage one.
Strength doesn't matter except making it quicker to kill a sea giant(more damage = less swings). High dex is nice as it allows you not to be hit as much, but again isn't necessary as you can supplement dexterity with armor and blocking.
I would strongly recommend up'ing your vitality and thereby increasing your stamina. You should have a minimum of 180 stamina points(hit points) before taking on a sea giant, as they can do that much in 1 blow(and no matter how many health potions you have if he hits you for more stamina than you've got you can't heal that!).
So to end the post lots of strength and dex help as does a lot of stamina points, armor, and learning to block. Raw numbers won't help much because we all play slightly differently. I would expect a veteran player to be able to kill a sea giant with lower stats than a novice player, for example.
I hope that helps.
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"In the mornings, when I'm usually wide awake, I love to take a walk through the gardens and down by the lake, where I often see a duck and a drake, and I wonder as I walk by, just what they'd say if they could speak although I know that's an absurd thought."
-- Conjunction Junction by Schoolhouse Rock