I suggest not playing a "tricky" opening like the Tango at your level.  I bet you're getting killed in queen pawn openings from lack of space that results from blocking the c-pawn in; that's a very common symptom of games I see played by U-1400 players or so.  It's very hard to know when you can bend the rules (i.e., don't block your c-pawn by a knight in Q-pawn openings) and when you can't, especially when you don't have much of a level of sophistication.  

Why not play one of the myriad of other sound openings that allow you to get a playable middlegame?  There's the QGD, the QGA, the Tarrasch, the Semi-Tarrasch, the Slav, the Semi-Slav, Nimzo-Indian, Queen's or Bogo Indian, etc...  Of course there's nothing wrong with the Tango, but I question whether you could really play it effectively without first understanding the related ideas of the main line QGD, Chigorin Defence, and Nimzo/Bogo openings.

I think the answer depends on what White plays instead of c4.  But in general, 2...e6 would be consistent with a Tango repoirtoire.  For example, 1. d4 Nf6 2. Nf3 e6 is fine.  If now 3. c4 Nc6, you are back in line with the Tango. However, other likely posiibilities are 3. Bg5 (Torre)  and 3. e3 (Colle).  Also popular is 2. Bg5, when 2....e6 is perfectly fine also. 

To get more information, you might want to get John Cox's book on d4 deviations, which I understand is really good. 

Having said all of that, I am not sure if at 1200, this would be the best use of your time. You might want to consider a simpler more classical opening like the QGD or the slav; and spend less time worrying about opening  theory (which is a lot less important at the 1200 level) and more time on other parts of your game.