What job opportunities/prospects and environments are available to someone with a Bachelor's of Science in Applied Psychology?

Depending on the state you live in you could do therapeutic staff support work for children with emotional and/or behavioural disorders/syndromes in most public schools. The hiring organization will likely cover the costs of any required trainings our certifications to do so beyond your degree. I got such a job prior to graduation with a pending BA in psychology with a focus on psychopathology.

I have a PhD in Psychology, the degree you need to have to call yourself a psychologist (in most states/countries). Regardless if you work in an office/hospital setting or provide services online, you MUST be licensed. In the US, each state has its own rules about how to become a licensed "Psychologist" and about what qualifications are needed to be licensed as professionals in other human service fields (eg, licensed professional counselor, substance use counseling).

Any sort of BA in psych can get you entry level/support staff jobs at clinics that provide treatment such as advanced behavioral analysis and care for individuals with cognitive disabilities. You might also be an appealing candidate to work at a crisis line or help with the admissions process at places like substance use treatment facilities. The salaries or hourly rates are not great, so you may want a longer term plan to further your career. However, to understand what these jobs are like, you should have internships or jobs so you can determine if it is worth the time/money for you to pursue the field.

Regarding your online treatment question: any type of treatment received via online or other digital/phone means is referred to as "telehealth". At this time, you can only provide online/phone services to people who reside where you are licensed. For example, if you are licensed in New Jersey, you cannot provide treatment to people who live in other states or in other countries. In addition, you need extensive cultural diversity and sensitivity training to be qualified for any therapy job, but this is very important if you have hopes of working with people of diverse cultures. Psychological approaches are always considered within the context of the group's culture and way of life. In addition to licensing laws, there are many other restrictions on how telehealth can be provided. Good luck, and ask your professors/teachers for advice!