You cant really go wrong by making all the extremes and overloads from them. If your plan is to do pvming in the future then you will need to do overloads anyway. You need to make 1200 sets of extremes and make them into overloads to almost exactly get herblore 96 from 88. Keep in mind that this is a lot of money needed, and that you need to boost your herblore level with some method along the way while using the log out "trick". Good luck :)
Why one herb level? Because you need 85 herblore for super anti fires. They are pretty much required for effective killing of QBD. You can get +5 herblore boost with spicy stews(brown). But yeah, since you can't afford and don't have the stats for drygores, you should first hit dungeoneering 85 or more. Get dual chaotic rapiers, then you can also camp frost dragons. They are very good money with your stats. Duo bandos is also a possibility but this is not a very good gp/h method.
Quote from RuneWiki: Assuming one obtained each signet on the 64th kill, it would cost, on average, 168,350,712 coins to create an ascension crossbow. GE mid is 181M for bow, so that makes roughly 12.5M profit.