I can help you with the outlook portion. If you want to be a BIOLOGIST a PhD is required. Biology is a field with a major case of education inflation. If you want to work in the field (Park Ranger/Forester/DNR), you’re ok with a BS and/or MS.
Be weary of the major and what the major requires, it varies a lot by school. At some you are basically a regular Biology major and have to suffer through the pre-med weeder classes which are notoriously difficult. Try to find a program that doesn’t require organic chemistry if at all possible.
As for salaries- not great for the amount of work it takes to get a PhD and varies widely for the fieldwork positions.