You probably need to side-load a Market.apk file that's been hacked to work with your device.  This will require root.  You could also load a custom ROM with the Market already on it.  [I recommend searching XDA][2].

That said, you won't be able to get Flash unless you have/get 2.2.  [Flash requires Android 2.2+ as well as an ARMv7 or better processor][1].  The 70 series is supposed to have an A8 Cortex based on ARMv7, so that part's OK.

  [1]: http://www.adobe.com/products/flashplayer/systemreqs/index.html#mobile
  [2]: http://forum.xda-developers.com/forumdisplay.php?f=877