I’ll do it for you, soあげる expresses doing something for someone’s benefit, and から gives a reason or introduces what follows. The subject may be someone other than “I,” depending on context.
I’ll give it to you, soあげる means “to give” or, after another verb, “to do something for someone.” から gives a reason or introduces what follows, often with an implied “so.” The exact subject and object depend on context.