Hi Shasha20,
I know what you mean... I'm new too. I've been using the starter kit with an extra 78mm battery for about 2 weeks now. My only experience is with the cartos. I read that some have gotten 20 refills. That's probably on the high side. I don't plan on running it down to empty tho. For my second shipment, I received 3 bottles of eliquid. I am using them to top off every time I switch batteries. It seems that 1 carto will last about 2 slim batteries, give or take. By topping off, I hope to avoid premature burn out.
I got the smooth sample pack, a pack of mint, and a pack of cappucino. For bottles I have, cappuccino, freedom and country. I can't say I love any of them, but they do the job for now. When I find my taste buds again, I will probably try the sample pack again, and move up to the little tanks / clearos. The cartos are easy enough to re-fill, a little messy at first getting used to it. I do wish I could see better when they are close to empty.
The x2 clearo is out of stock, and I think they are discontinuing in favor of the x2 T3. The x2 battery OTOH is my next HW investment. I promised myself I would not spend more on ecigs than I was on cigs, so I have to wait a few more weeks for any more purchases.