Does anyone have general tips on buffing the different types of characters or how I should construct the team? I'm running with the original 4, even though I just got access to a new one.
Dragon Age basically uses the tactics that have become popular in MMORPGs. The ideal composition for a party is tank, healer, and two damagers. Your tank's job is to get enemies attention so they will attack him instead of your other characters (hence, the tank is a defensive role). Your healer's job is primarily to keep your tank alive so he can continue to control the battlefield. Your damagers are there obviously to take the enemies down as quickly as possible.
In Origins, Alistair will be your tank at the start of the game (and likely all the way through the game). Make sure you get "taunt" and "threaten" for him, and set him to have the "Defender" tactics preset. Fill out the rest of his Sword and Shield talents to get sustained talents which will raise his armor or defense. Give him the best armor you can find. Get at least one heal spell for Morrigan and configure her tactics so the heal is high up on her list. Your rogue, Leliana, and Sten are all set up as damagers, so early in the game, Alistair is your only tank and Morrigan is your only healer. You will get a much better healer later on.
While you can get through the game with pretty much any party combination, this is really the party setup the game was designed around. When you get a chance to go to the Circle of the Magi, you can get a healer who will make the game much, much easier.
How often should I be talking to the team? I have started sending the dog out to find things, and noiw have quite a few gifts for later, but he loves me already. Is time a factor in the game, or can I continue to ramble around like I have been doing? I have a couple hundred hours into Oblivion, and have yet to start the main quest (I've never seen an

bliviongate: ).
You can talk to your party members as often as you like, although usually just talking to them in camp between quest missions is enough. You don't have to talk to them at all if you don't want. Time isn't a factor in the game, and the darkspawn horde, much like the forces of Mehrunes Dagon, will happily put their invasion plans on hold until you take on a story mission to advance the plot. However, it is very much a story based game, and aside from a few side quests in Denerim, there's really nothing to do except the main quest.
I've played quite a few hours, but I'm not really getting into it like I did with TES. Part of that is trying to figure out the controls and characters, and part is the way it's scripted, rather than free-roaming. Any tips on how to get into the flow quicker? I'm not really having "fun", which is the point of gaming.
It's not a sandbox game, and if this kind of game isn't your cup of tea, there's nothing wrong with that. Either it appeals to you or it doesn't. Don't force it. I happen to prefer games with strong stories, and the free-form wandering of sandbox games is largely lost on me. Different strokes...