The process for generating a bootstrap distribution is remarkably similar to the process for generating a sampling distribution; only the first step is different.

To make a sampling distribution, you start with the population and sample without replacement. To make a bootstrap distribution, you start with a sample and sample that with replacement. After that, the steps are the same: calculate the summary statistic that you are interested in on that sample/resample, then replicate the process many times. In each case, you can visualize the distribution with a histogram.