I just got into EDH about a year ago and I definitely love it - requires a very different approach to deckbuilding. The mana base is obviously super important, and I wouldn't recommend going as low as 32, unless you're running a lot of mana rocks. I would play 35 in a mono-colored EDH deck and feel okay about it. Most of my EDH decks use around 37 lands + mana rocks and I rarely get screwed or flooded.
Sol Ring is pretty much mandatory in any EDH deck, and if you're running a multicolored deck, guild Signets (ie
Azorius Signet,
Rakdos Signet) are very effective mana rocks as well.
You definitely need to run card draw, because even in draw-heavy EDH decks, I've never drawn more than 50-60 cards in one game. Cantrips are your friend, since they have effects/leave a creature on the board AND draw. You're not going to touch a lot of your deck so it's good to have multiple cards that can have the same effects (ie
Parallel Lives and
Anointed Procession in a token-heavy GW deck). Cards that give options are also extremely valuable -
Dromoka's Command is necessary for me in any GW deck, just as
Merciless Eviction is for me in any BW deck.
Hero's Downfall replaces
Murder any day of the week. Since you won't be drawing a lot of your deck, having one card that can get you out of multiple jams is REALLY good.
Sorry if this is info you already know! Good hunting!