I'm just going to recommend an
HH.357. These are highly prized dripping atomizers, well known for quality vapor and superb flavor.
There's a small list of to-dos for "priming" it for the first time, and the recommended cleaning method. See list at the bottom of the page. But honestly it doesn't get any easier than that. Thread it on, fill it up 5-7 drops, vape!
If you are looking to get into rebuilding, the IGOs are all great ones. However they don't offer adjustable airflow, so it may or may not work with your preferred way of vaping. For that reason I would suggest something like the Crown or Helios.