They're fine. I've used fizz drops and coopers drops. Both are a pre-measured amount of dextrose and sucrose for priming beer to about 2.5 vols of carbonation, which is about average for most ales and lagers. You pop one into each bottle before you fill it up with your finished beer and cap the bottles and you're done. If they're free and come with the kit, go ahead and use them. If not, save your money and just use a priming sugar calculator to figure out how much to add to your batch for the right level of carbonation you want. Typically, this is about 2 oz of corn sugar (or brown sugar). Take two cups of water, bring it to a boil in a pot and add your sugar. Stir to dissolve completely. Once dissolved, remove the simple syrup from your stove top and pour it directly into the bottom of your bottling bucket. Then, rack your beer on top of the simple syrup so that it mixes completely with it. Bottle your beer, and cap it. Done.
The hard part for any new brewers is the conditioning time between priming with sugar and cracking open that first bottle. I'd recommend waiting at least two weeks (three or more for bigger gravity beers) with your bottles conditioning in the dark at room temperature. After that, put them in the fridge a full 24 hours before pouring. Enjoy.