If you're looking to eat take a trip to world 1 where people power fishing and offer free salmon or trout RuneScape Gold. Magic: Learn to use the mage dumbies until they stop you from doing it. Once you have achieved the level of magic required to cast a few curses. Make these curse spells for the Zamorak monk who is in Varrock Castle. Varrock Castle, directly on the left side of the staircase.
If you get to the magic level ( I believe it is 25, I believe it is) use Curse against the Zamorak monk. When the level is reached you can also superheat (really fast xp, and you can break even if you make steel bars) as well as high alch. Leave prayer alone, set your goal at 40 (45 if you get the 3h gravite).
The glacors drop three costly sets of boots - I believe they're 8M, 15M and like 22M. These boots are dropped on average (from the information I've received - - be sure to correct me if I'm incorrect) about every 500 to 1000 kills. Glacors may not be the fastest things to eliminate (albeit they aren't the most slow by far).
Lets say, then, Glacors are dropping around. 15M each time they kill 500. I say 500 because there are also other drops (notably shreds), so this helps in calculating such drops.
Barrows items are dropped, at an average of 1:15 iirc. These items range from like 50K to 1.7M at present. Many of the items are near the 1M mark , but below, few are above 1M. So let's say 1M every 15 runs - this accounts for runes and the like and Old School RS Gold. Barrows is very inexpensive and you'll end up with a lot of blood/death runes left over if you are using Polypore (which is what you should).
The Wall