Annyong ha shimnikka
I work at Whitetail, which is a sister resort for RoundTop. We've had several PE teachers become ski instructors over my tenure. The vast majority of our pros are part time and keep their day job during the winter. We also have had some landscapers, farmers, tennis pros and semi retired people work a full time teaching schedule.
The best way to get started as in instructor is to attend what is called an "Instructor Training Clinic". These are usually held in two parts: indoors and on snow. The indoor portion is typically held in November and the on snow portion is held shortly after opening day. Some resorts may hold additional on snow sessions in March. You should check web sites
or call the ski school office to get additional details. The fee for this clinic is typically slightly over the cost of lift tickets for the on snow portion. After the clinic, you may
be offered a job as an instructor. With your teaching background, you've got a great head start. As an intermediate skier, you may need to work on your skiing skills before you are ready to teach, but most resorts would much rather hire stronger teachers with weaker skiing skills because we are better at improving skiing skills than we are at developing teaching skills.
Patrollers go through a similar set of on snow and off snow training prior to getting hired. With a smaller staff than ski school, there are less openings to fill. It can sometimes be harder to get on staff as a patroller than an instructor. It's especially harder to get a patroller job that pays (most resorts use a lot of volunteer patrollers). At Whitetail, most new patrollers start their on snow session in March. Most patroller candidates already have some medical training. So if you want to pursue the patroller option, you could start brushing up and getting some certs. Patrollers don't need the best technique on the planet, but there's a huge difference between "handling the blacks and the bumps" and taking a sled with a 200+ pound victim down those slopes.
There are also lots of other jobs available at the mountain. Many resorts offer unpaid volunteer positions where the requirements for skiing ability and time commitments are not as great. You can see some of those options on the RoundTop link above or on this Whitetail link
No matter which option you choose, getting a part time job is a great way to reduce your per day skiing costs and give you a good excuse for getting more skiing in than what you would otherwise do. But what most people do not realize is that getting a job at a resort means joining "the family". It's wonderful having a new circle of friends who all share our love for snow sports. We'd be honored if you chose to join our family.