These will be fillable with the bottles. You won't need a syringe or anything special.
How much juice you use, depends on how much you used to smoke, what the nic content is and how hot you're
vaping.
Rule of thumb is that most moderate vapers go through from about 3 to 5 ml per day.
It's usually a little more expensive to buy the batteries separately once you add in the charger and cartomizers. The vendors pretty much make sure their kits are less expensive than the separate components.
You should add 2 more things though. One or two atomizers. You want at least one atomizer to test your juice before you fill a carto with it. Once you fill a carto, it's committed to that flavor. If you are going to be trying a lot of flavors, you should pick up a box of Boge 2ohm cartomizers. These megas that come with the kit are very large and should be saved for your favorite flavors. The "debridged" atomizers are on the accessory page and are ideal for testing juices by dripping a few drops straight onto the atomizer.
Also, get at least one drip tip. Use it with the atomizer to test flavors and put it on your cartomizers so you don't have to wrap your lips around the cartomizer itself. It also helps with topping off the cartomizer to prevent it from drying out. Otherwise you have to pry the plug off the end every time you add a couple drops.
So, with about $15 or so in these extras, you'll be set.
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