1. I got the blade of woe from the dark brotherhood and it has some type of special effect to it. I noticed every time I use it the effect goes down a bit and I wanted to know how to charge it back up once it's out?

2. How do I get the option to make good weapons? When I try to make one I only see the crappy stuff I find on bandits.

3. Can unique horses die? The ones that were given to you through a quest?

4. Can you talk to giants? I've tried and lets just say I ended up on the throat of the world way before I should've been.

Any help would be appreciated, thanks!

1.) filled soul gems. hover your cursor over the weapon and if you have a filled soul gem in your inventory there will be an option to recharge the weapon
2.) you'll find better gear as you level up. welcome to the elder scrolls. for crafting, increase your crafting skill
3.) shadowmere? no
4.) no

i got shadowmere, he lasted 5 minutes before i sent him rocketing forward after i jumped too high off a cliff, havent seen him again yet

I have a lot of soul gems but I don't know how to tell if they're filled or not. Btw, how do you fill them up?
I heard you can create strong weapons without leveling up, so if I level up my crafting will it give me that option?

Good to know shadowmere can't die. I love that horse.

in the name of the soul gem or just after it, if it contains a soul it will be displayed in parentheses.
to fill an empty gem you need the spell 'soul trap' and the ability to cast it. then, cast it on an enemy and kill the enemy before the spell wears off. if you have an empty gem large enough for that enemies soul you will capture it.
you can create 'stronger' weapons without leveling but the higher level gear won't appear until you level up.

Oh I see. I ignored soul trap because I thought it was useless, Thanks for the help!