Even if this is your first time studying abroad, or your first time ever being out of the country, it's okay - you will be safe and enjoy yourself.
Loop Abroad is wonderful at answering questions - you just have to ask. As for the trip itself: make sure to bring more clothes than you think you need, especially for the time you spend at Elephant Nature Park. Since it's very hot and humid, you'll want to change clothes much more than you would at home, and you want enough clothes to last you through the whole week (and longer). Additionally, conditions at Elephant Nature Park are more "outdoorsy" (i.e. you will sleep in cabins without air conditioning and be working outside all day), so bring clothes for that week that you aren't afraid to get dirty.
This is dependent on the week. During one of the weeks, participants are staying at Elephant Nature Park outside of Chiang Mai. During the day, you and those in your Loop group will be doing various veterinary activities with the elephants, dogs, cats, and horses in the park. These include a diet study, a fecal/urine analysis, time spent at the park's cat and dog clinics, and rounds alongside an elephant veterinary professional. Meals will be eaten with the other Loop participants and those staying at the park. There will also be an activity every night, most relating to local Thai culture.
During the other week, participants will be staying at a hotel in Chiang Mai. During the day every day, participants will learn about veterinary medicine at a rescue clinic, and in the afternoon/evening, participants will do an activity (related to Thai culture) in Chiang Mai.
I was nervous to be abroad alone, as this trip was my first experience leaving North America. I was mainly nervous that I would be unable to communicate with my parents and other loved ones if something bad were to happen. Thankfully, I was able to contact my parents every day of the trip. I didn't need a SIM card, like many places we went to had WiFi access.
Another question I had prior to this trip was whether any prior animal science knowledge was needed to fully participate in the trip's activities. My (relatively short) microbiology experience has not given me prior animal science knowledge, and I worried I would be unable to completely understand what we learned in the clinics and at ENP. However, this concern was for nothing - the veterinarians who traveled with us did a great job of filling us in and explaining what was going on (and why).