Some merchant sells them with infinite inventory. For example The Hinterlands starts with 4 lvl and ends with 12 lvl so if you feel its too hard just adventure somewhere else and come back later.
You need at last one Rogue in your team all the time to open closed doors.
Starting Tips & Hints for beginning of Dragon Age: Inquisition
Dragon Age: Inquisition its Single Player (with Multiplayer Option) Role-Playing Video Game released on November 18th 2014, for PC Xbox 360, Xbox One, PS3 and PS4.
