I could need some advice from more experienced playes (which is the majority here), please don't flame a returning player with a low cardpool for being in low ranks

I played hearthstone at release and stopped shortly after. I returned a few weeks ago and could need some advice for a deck that can easily reach rank 15 in a season for the new end of the month reward.
I know that good players posted videos how they use decks with basic cards only and reach better ranks, but I got a hand to pick fights with all those "I got a full golden deck with at least 8 legendary cards" people in the low ranks which makes climbing frustrating
my Ressources:I got Naxx 1+2 and BRM 1 unlocked, I got 670 gold and 80 dust (I will use my gold to unlock the other wings, starting with Naxx. I just care for the cards in those wings, not for the hard mode reward).
2 of more precious cards I'm willing to disenchant (unless you recommend keeping them) is a Baron Geddon (400 dust) and a golden Tinker's Sharpsword Oil (50 dust).
I also got 5 epics, but I want to keep at least the shaman card. I got "Lay on Hands" (Pala), "Preparation" (Rogue), "Earth Elemental" (Shaman), "Brawl" (Warrior), "Junkbot" (neutral).
Is one of those epics worth being disenchanted instantly?
Baron Geddon is my only legendary which does not come from naxx / brm.
Right now I play these decks for dailies and rank 20-17:- a cheap Pala deck (tokens, not secrets. Mainly with stuff like knife jugglers, muster for battle, 1 Defender of Argus etc., but no epic / legendaries exept for Emperor Thaurissan and Loathep)
- a cheap Patron Warrior Deck (I still need Death's bite and my only legendary in it is Emperor Thaurissan, but it's my most expensive deck with several rares like 1 commanding shout, 2 Armorsmith, 2 Frothing Berserker, 2 Grim Patron)
- a hunter deck (changing it from time to time; low budget stuff, but I got 2 Flares and 1 Misdirection)
- a shaman deck (1 mana tide totem and 1 earth Elemental are worth mentioning).
These are some deck concepts I was thinking about:- Mech Shaman (still worth it? I wanted to build it before the Tournament came out)
- Totem Shaman (disenchanting Baron + oil might give me the very basic cards (totem golem, Tuskarr Totemic, Thunder Bluff Valiant) --> my favourite right now
- Paladin deck with Murlock Knights (upgrading my old deck step by step. With more murlocs or pala tournament stuff? Secret Pala is too expensive right now)
- Hunter (disenchanting Baron + oil might give me King's Elekk, Eaglehorn bows and 2 blue traps for a medicore face deck).
- Pirate Rouge (might be too expensive; I don't like Rogue much, but I love pirates and it seems to be quick and strong at low ranks. It was fun to lose against it.)
- Patron Warrior (only because I got several needed cards; I'd prefer other decks)
--> the biggest problems are my ressources (I'm not willing to pay $ for additional packs and prefer to unlock naxx + brm before playing any more Arena). I would prefer quick or midrange decks over long games, but that's optional of course when I look at my current amount dust ^^
Thanks in advance for any advice.
This post was edited by Bunkerassel on Sep 1 2015 12:36pm