First and foremost, if your playing teeg then you need to drop any non creature spell over 4 cmc.The only one's I would consider playing is Alluren if you can find one and Mirrari's Wake because that card is absurd. Second, you need ALL the mana dorks, all the elves, birds, ect. The mana rocks that are good with Teeg are usually the really pricey ones so creature based ramp is the best option for a budget. Third. Undercosted beatsticks like loxodon smiter are not good in EDH. If your plan is creatures they need to have immediate impact on the board (ETB or static effects). You also need a way to win that's not combat damage. It's way to easy to assemble 2 card combos that gain infinite life or make combat impossible, even in more casual groups. I know most people complain about infinite combos but they are a necessary part of EDH. G/W is pretty limited to what it can do in that regard but the best one to jam into your deck is probably Rest in Piece+Helm of obedience or dumping infinite mana into a Walking Ballista.
If youre not comfortable buying your own parts I would recommend going to your nearest PC store and talking to some one there. I built my PC for about 1000$ total and thats including my first GPU that I shorting out.Tell them what you want and your budget and they should help you out. Most part supply sites have sales on everything so shop around first before you buy. There's nothing wrong with buying used as long as the parts are in good shape. Just be aware of compatibility issues. I have no experience with Linux so I can't comment there.