We'll actually kill two birds with one stone here and discuss finding the best e-liquid in general, and which e-liquid are best for beginners. Because 'best' is a highly individual ideal, this will depend entirely on your needs, wants, and preferences. Which means you'll have to do some research. But we can help you get started. As mentioned above, eliquid has four main ingredients. To recap, those are PG and/or VG, nicotine or a non-nicotine substitute, water, and flavor. If you're not a nicotine user, rejoice–every single variety of e-liquid is available in a nicotine-free variety and there are even e-stores that cater specifically to you. If you do require nicotine, you need to figure out what level you need in your liquid. Tobacco cigarettes aren't labeled in the same manner as vape liquid, so this will require some research. The 'average' cigarette has between 4 mg and 14 mg of nicotine. With some time spent searching the internet, you may be able to find out the levels in your typical brand. If not, you may need to estimate and go by trial and error.
There are guidelines available to help reduce the 'error' part. First, always opt for the lowest level you're considering. The higher the dose, the greater your chance of developing nicotine toxicity. Next, how much you smoke will affect the dose you need just as much as what you smoke; the more cigarettes you smoke in a day, the higher a level of nicotine you're likely to need. The strength (ultra-light, light, full flavor) of your cigarettes makes up the final consideration.
A very simplified guide follows: 3 mg/mL (0.3%), which is somewhat difficult to find in ecigs, is the lowest commercially available and is best approximated as an ultra-light cigarette or a very infrequent smoker. 6 mg/ml (0.6%) is the lower of nicotine levels most commonly available in e-cigs. It's still quite low, nearest to a light cigarette. 12 mg/mL (1.2%) is closer to a regular cigarette, but on the low end of things–think of a mild full-flavor.
The next levels are less common, so if you require these, there will be more searching in your future. 18 mg/mL (1.8%) is pretty middle of the road. You're looking at a relatively average cigarette–not too strong nor too mellow. 24 mg/mL (2.4%) is getting up there. Heavier smokers, and those who prefer noticeably strong cigarettes likely want to start here. 36 mg/mL (3.6%) is often the highest level e-liquid sellers will offer. If you are a very heavily addicted smoker–think 2 1/2 packs per day–or you prefer unfiltered you might try this. There are a few manufacturers offer 50 mg/mL (5.0%). Unless you literally have a cigarette in your mouth from waking up to going to sleep, you'll probably want to avoid this level.
We're not done yet! It gets more fun though. Start thinking about flavors. If it's something you can imagine eating or drinking, there's probably either a flavor or recipe for it. And yes, there is a bacon flavor. Eliquid Flavors have their own section in this guide–up next, in fact, so this will be very brief and mainly in relation to the final option: PG/VG ratio. Some flavors, like traditional tobaccos, you'll want a higher amount of PG, so you don't get an incongruous sweetness. However you can use PG with sweet flavors of vape liquid, and higher VG levels will enhance the sweetness.
