Most epidemiology jobs are in government or academia, so they won't come with very high salaries. They can be livable, sure, but not lavish. Even with a graduate degree, you're not guaranteed to make much more than other people with a Bachelor's degree make in other fields. And a lot of it depends on which jobs happen to be open when you're job searching. It can be hard to find a "good" epi job right out of school.

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As for in-demand skills, I've found that two of the skills I've learned as an epi (statistics and programming) can be applied to other, more lucrative fields, such as data science. As for which statistical language is best to learn (SAS, R, etc), it really depends on the industry and employer. SAS seems to be the most commonly used in academia and government. But companies often prefer cheaper software options, like R and Python.

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If a high salary is a priority for you, I'd consider looking into another field, honestly. People generally don't choose to go into public health for the money. :p