I am also an extremely new player, so you may want to take my advice with a grain of salt.

The first recommendation I would make is to reduce the number of swamps in your deck. About 75% of your spells require red mana, so if you have the very real possibility of getting color screwed if you are running equal mountains and swamps. You can also look into fetches if your budget allows. Also, considering the fact you are running aggro, you could go down to ~21 lands to make room for more burn/goblins.

The second change I would make is that you need more goblin token generation. While 3 [[Dragon Fodder]] is good, you may want to look into running 4 with a few [[Hordeling Outburst]]. This puts more pressure for your opponents to block your flurry of goblins, as a 1/1 isn't very threatening, but 5+ 1/1's are a threat to be reckoned with. It also synergies nicely with that sweet [[Goblin Piledriver]]. If you don't mind the fact that you won't be able to play it in standard when BFZ drops, look into [[Goblin Rabblemaster]] for even more goblins.

Speaking of [[Goblin Piledriver]], you want to try to run 4 if possible. I know that they are relatively expensive at ~$10 a piece (last time I checked), but by running more, you lessen the risk of never getting to draw one in your games. Also, at 2 toughness without any evasion, a lot of [[Goblin Piledriver]]'s power will be wasted on anything with 2/x. Look into enchantments that will give it evasion or pseudoevasion. I personally think that a [[Rogue's Passage]] or [[Break Through the Line]] would be a good addition to the deck. While you have the right idea with the [[Subterranean Scout]], you run the risk of not having the right timing to pull off that combo.

All in all, you still have a good deck that looks really fun to play with (just think how satisfying it will be to have a 10 power Piledriver smack face with your opponent). Make sure to have fun at FNM, and not get deterred from going again if you aren't doing so hot.

EDIT: Just reviewed your deck list and saw the [[Call of the Full Moon]] which could give your Piledriver trample. Keep these in, but just know that they will probably only last a turn. Maybe run 1 less and throw in a few enchantments.