I unlocked the first wing of BRM with gold, should I not bother with the others?
Eventually you will want them to play some fun decks. However, they aren't requirements for a decent deck as the cards crafted from dust/decks are far more valuable if you need late game cards.
I would start unlocking Naxx from now and see what you want to do. That way you have Haunted Creeper, Sludge Belcher, Mad Scientist, Nerubian Egg, and Loatheb.
Again, in the end, your willingness to spend money is the factor here.
So i'm pretty new to the game and have been leveling up all the classes to 10 to see which style i like and really enjoying it. I just bought Naxx since i wanted a bit more single player content and have an extra 10$ to spend on some card packs. Should i be getting the new packs or the goblin and gnomies pack?
Also whats a good guide or site for decks to test put? I suck at building decks and it seems overwhelming for me, i somehow got to rank 22 on the stock decks >_>.
I'm technically still a new player as I started this year. You may also want to consider doing arenas.
Also, it's better to use money to buy whole expansions. You're not guaranteed good cards to your collection just by buying packs.