You will need ClockworkModRecovery to un-brick a tablet if you did what I did to mine. Once the recovery is working, you should be able to either restore the original images, or install CyanogenMod Android instead. Instructions can be found here.
For free Android apps, I can't recommend Freewarelovers.com highly enough. Google play has been a thorn in my side since buying my first Android tablet. I find downloading the apps to my laptop and then copying to sdcard much easier.
Apps I use/have used
Kindle App, you may need to try a few depending on your Android version.