My suggestions are these
1. Do get a backpack in Ostagar and remember to get a second one before you start the big battle. They are the least expensive in the game and you will need every ounce of space later on.
If you want to fight for the downtrodden, City Elf origin is your path.
If you want the best written beginning in the game with a big shocker (unless you've read spoilers) Dwarf Noble is your path.
If you want the best beginning with the most satisfactory ****** for tat moment later in the game, go with Human Noble.
Once you've made it through with one of the above, start a second game and be a mage, just for the fun of using Walking Bomb!
I love Origins. I've played it many times, and I still choke up at the end. It's just that good. Have fun and remember that the game came out in '09 so the combat is...slow. Come back and tell us what you liked best about the story, and which major quest was your favorite.
P.S. DA:2 - You'll hear complaints about it, but trust me, the game grows on you over time, particularly if you get the DLC to go with it.