Can't get easier than a CE4. For cheap disposable junk, they do remarkably well, better than my Evods.
I second the above. Empty your tank, wash it out, blow through it from the bottom to clear out the airtube, then try again. It fills from the top, run your juice down the side like drawing a draft beer. Stop when it gets right above where the wicks are and the air tube narrows down at the rubber seal. Put your tip back in, draw reasonably hard on it without power until you smell the juice, then vape.