My wife was already married before she married me, & never divorced her first husband, she left me 2 years ago & I don't know where she is what can I

It is really your spouse who needs to worry because she is the one who has committed the crime of bigamy, not you.  Because your marriage was void from the beginning, you do not necessarily even need to get a divorce or annulment.  The reasons to do so would be if you have joint property you have acquired that needs to be divided by the court or just to clear up the vital records.  If you can't afford a lawyer to do this for you, you may want to check with your local bar association or legal services office to see if they can help you.  Your local Circuit Court may also be able to provide you with the necssary forms to try to do it yourself.  If you don't know where your spouse is, you would have to serve her with notice by publication in the newspaper, which again the clerks should be able to give you the forms to do.  But unfortunately if you can't find her the the court cannot do much about any property issues, which is leading me back to thinking that you may not want to bother with this.  Plus she has two years in which to come back to the court and revisit any property issues.