if you just started just fyi, you will not be able to trade unless you complete a certain amount of quests. if you can actually trade you can try and post an item or something on AH for less than 25 min bid and max bid so u wont incur a posting fee. But if you are not able to post items to AH yet there is no way to get you AD. and you also cannot trade with ppl until you have those quests completed.
IF you followed the way from the start i think you have to complete blackdagger the first big area after the crown quest line, and you should be good to go.
lmk i do have some stuff for trade (azure rank 12, radiant rank 12, rank 7's, rank 8's, couple dragon hoard enchantments rank 8 and 9, and more), i would trade these the same as AD 100 fg per 100k per AH (minus 10% ofc)