Congrats on getting it up and running!!!!!!! No worries, I had some similar issues when I started. I had juice but had just ordered a Lavatube and was trying to figure out how to get the juice from the bottle in the tank.... LOL! It came with a pre-installed carto and I couldn't figure out how to get the carto out of the tank enough to get the liquid in. Then I didn't know I had to prime the carto! So, I burned it. YUCK! But, unlike you, I felt embarrased to ask questions (I was very green....), so I goggled, watched videos, ... until I finally got it working. Now, I love vaping. And no, the liquid should not leak, definitely not spill out, it may leak a bit inside the drip tip but it will not flow outta there unless your clearomizer is cracked.

Good luck! I don't own a Riva and never used these clearos before but I've experimented with enough clearos, cartos, tanks.... to get an idea of what you're looking at. Happy vaping!@