Paul wrote:
My first question so far is that i've been doing some research on
the net trying to find a translation to the word or action "To
Overcome" (as in to prevail, and to win over. Not, to be overcome by
sleep, or to lose to something or someone) in Old Norse.

The glossary in Gordon has:
sigra (aĆ°), to overcome; refl. gain the victory.

Hope this helps,
Laurel