SDR Internship Advice- How to prepare, what to expect?

Got an SDR internship for a niche software firm (homebuilding/construction management). Stated in interview I’m expected to do 50-100 cold calls a day, as well as taking notes on AE calls.

What should I expect in this role, especially as they said I’m the first sales-only employee at the company. Been watching a lot of youtube videos but any help is appreciated! The role is $20/hr.