Statistics - samples. Test tomorrow?

Please help me understand what this means, how I am supposed to do this.

From the x row, select without replacement and list a samples of a size n=2

X 1 2 3 4

P(x) 1/4 1/4 1/4 1/4

Calculate $\displaystyle \bar{x}$ for each sample and list the unique $\displaystyle \bar{x}$ values. Construct a sampling distribution for $\displaystyle \bar{x}$. For the sampling distribution find $\displaystyle \mu$ $\displaystyle \bar{x}$ and stand $\displaystyle \sigma$$\displaystyle \bar{x}$.

Any idea how to do this? I am so lost. Even if you can help with just a part of it, it would be much appreciated. Thanks