Unfortunately, what you're talking about sounds like the unauthorized practice of law, at least with respect to wills and contracts, probably employee benefits. I imagine investment businesses are regulated in some way, but not by the state bar unless it's some sort of finance law. Not sure what you mean by negotiations. Immigration work is not necessarily the practice of law but anything involving immigration law would be off limits.
I agree with the above poster that you should take the bar examination. Even if you are in a tough state like CA or NY, there are options. I also agree that some background or paralegal work, under the supervision of a licensed attorney, might be a good way to get your feet wet.