I doubt you can deduct the prior years' legal expenses because your taxes are generally decided on a yearly basis. This response is for...

MD tax on LLC registered in another state

if you are doing business in MD with Wyoming LLC, you, nevertheless, have to qualify in MD as a foreign LLC. this is for informational purposes...

Can I amend my 2006 to 2010 tax returns to married filing jointly? It would significantly reduce my tax debt. Or is it too late?

From the information provided, I doubt you can file jointly for 2006 (I assume your ex-wife filed her separate return timely in 2007), but it would...

My property was recently sold at a tax sale to a party that a few mos prior paid the tax liens. Do I have 1 year to get it back?

you do have a period in which you may recover your property. I suggest you contact a tax attorney in your area. this is for informational purpose...

I will be not working for whole 2015 here and any other country .Do I still to have to file income tax return?

Assuming you are a U.S, citizen or resident of this country, I would recommend you do so in order to commence running of the Statute of Limitations.

My mother passed away this year. Do I still need to file her taxes for 2014?

Agree that a return should be filed. She may be entitled to a refund. It is also advisable to start the statute of limitations running.