Rural land sells in the Southeast inquiry

My husband is currently doing his course work for his license and wants to get into rural land sells. I am curious if anyone has any insight on this niche in real estate sells? Our plan is for him to quit his job once he gets his license and go all in. I own a business and do very well so I will be able to finally support us while he gives this a go, but I am nervous because I don't know what to expect and would ideally want him to make as much as possible. I don't expect him to make multi 6 figures his first year but typically how long does it take to start making sells? Also, how do agents find land to list for sell? A few years ago, we purchased 3 lake lots by searching property tax records and contacting the owners so I assumed it would be a lot of work like that. Again, any insight would be greatly appreciated. Thanks!