My new tablet tells me that I am making a wrong pattern and I am not able to use it
What actually happened there is that:
You were setting up the tablet and it asked you to set a pattern for unlock. 

You then drew the pattern and repeated the same on reprompt. It got accepted and saved.

Now, you need to draw the same pattern to unlock the tablet. 

Here's what you can do if you have forgotten the pattern that you have initially drawn:
Go into the recovery mode and perform a factory reset. Now, since this is an unknown tablet, running on gingerbread, I cannot suggest the exact key combination to enter the recovery mode. So, just keep on trying all these combinations one after other when the tablet is powered off.

Note: Press and hold the keys mentioned.

Volume Down + Power
Volume Up + Power
Volume Up + Power + Home
Volume Down + Power + Volume Up
Home + Power


In the recovery mode, you will get the options for wipe or factory reset. Just do it and your tablet should start from fresh. Be sure to read the instructions while setting it up this time.

If you know the manufacturer of the tablet, then please try searching their website or directly on Google about how to enter the recovery mode on it.