That's a lot....3 ppd. Many people say the average is about 3 ml per day. I probably vape that much or more every day. Anyway, if 3ml per day is average, that's 30 ml (1 oz.) for about 10 days. That's a good rule of thumb at least. So for two weeks.....more than 30ml. But I would buy several different flavors in 5 or 10 ml sizes until you know what you're going to like.
VaporBomb.com has 5 ml sizes for $3.95. Some others do, too...I just can't think of them right now. And get some flavors you don't necessarily expect to like....they may turn out to be your favorites. For example, at first I thought I would want tobacco flavors, so I ordered a bunch. Then the vendor threw in a bonus bottle of Blueberry, and it turned out to be my favorite. Just try a bunch of stuff until your taste buds come back, and until you settle on several you like best. And get it ordered....there's absolutely NOTHIHG worse than getting going on vaping and loving it, then running out of juice. Better safe than sorry.