My first couple weeks vaping was similar to when I started with analogs. Sore throat and cough. I was flabbergasted. I figured after 35 years of smoking, vaping would be a piece of cake.
I'm not surprised to hear that other new vapers experience the same thing. As others in this thread have said, keep some water handy and stay hydrated. You might want to have some cough drops or hardy candy to soothe your throat.
You might even be overdoing it a bit. If you're anything like me, I was so anxious for my PV to arrive,that when it finally did show up in my mailbox, I vaped myself silly.
Hang in there, keep the water or juice handy, and try to vape in moderation.
As my Mom used to say when things got rough, "This too, shall pass".