Chances of RuneScape gold getting a clue scroll are very random. It could happen after five kills, or after 500 kills. It could be possible that you're just on an unlucky streak. If you are persistent about it, eventually you'll be able to get one.
There's no way to tell you when you'll receive a to drop your scroll if your RS status is Freeplay at the moment. They are members-only drops. However, I'll assume you haven’t updated that.
For money-making, I have always found that runecrafting is the most effective way to make it. Even if you can't craft the higher runes yet such as natures, crafting airs at lower levels could still yield a profit, though for a while it would be slow and tedious work. Other options include learning how to cut wood to level 60 at the draynor. Next you can cut yews, which can be very profitable.
To travel around the island, bring two prayer potions (you will require it along with all the protection prayers you will be wanting to make use of) four anti poison potions (really you will require these) one super energy (you do not want to be depleted of energy when traveling), and the rest with food. Cammalot Teliportation Runes are fantastic to use when you aren't eating enough food.
The below items to survive underground four prayer pots (4 super energy potions), 2 anti poison potions and the rest with foods (as long as you do not allow the mellee to hinder your progress). Be aware of your running and when you reach 50% drink a dose or buy 2007 runescape gold two of run energy, when prayer is at 28%, drink a prayer potion, eat when needed!