First of all, I believe the Runcrafting minigame, called the Great Orb Project, is one of RS gold the best ways to earn cash for f2p. So get 50 RC ASAP! Train Atk and then Strike Men at Edgeville. Next, we will visit the Guards within the palace in Al Kharid, and finishing up at the Flesh Crawlers in the second Stronghold of Secruity. The most ideal place for Flesh Crawlers is in the South-East corner of the room.
Range: You could do this with men as well, even at cows. Use the safe zone between the two feeding bowls that are south in the Lumbridge cow patch. After you've hit about 20 , move onto the Minotaurs within the initial level of the Stronghold of Secruity. Find a room to your needs and secure by a fence.
Iron arrows are dropped quite often, and it's free training. About the age of 40-ish, you can train with Hill Giants until 50. After 50, go back for the creepers that are in that south-east corner of the room. They can be found in the square at the door closest to the wall. This applies to both doors. (You will easily be able to get 75 Str/Range at flesh crawlers.)
If you're looking to eat take a trip to world 1 where fishermen power fish and offer free salmon or trout. Magic: Study the mage dumbies till it stops you from doing it. Once you have achieved the level of magic needed to perform some curses. Make these curse spells for the Zamorak monk in the Varrock Castle, directly in front of the stairs.
Once you have reached the magic level ( I believe it's 25) cast Curse on the Zamorak monk. Once the level is reached it is possible to superheat (really fast xp and you break even if you make steel bars) and high-alch. Keep praying, and limit your attack to 40 (45 in the event that you achieve the 3h gravite).
Glacors drop three costly sets of boots. I'm assuming they're 8M, 15M , and 22M. They are dropped in the average (from my sources - please correct me if I'm wrong) once every 500-1000 kills. The glacors aren't among the fastest thing to kill (albeit they're not among the slowest at all).
Let's suppose, for instance, that Glacors fall by about. 15M every 500 kills. I'm using 500 because there are also other drops (notably shreds) and this can help in calculating such drops.
Barrows items are dropped, in the average, around 1:15 according to IIRC. These items range from 50K to 1.7M at present. A lot of them are at 1M and under, few are above 1M. Also, let's say 1M per 15 runs . This account for runes and the like as well. Barrows is a very low cost option and cheap OSRS gold you'll end up with many runes of death or blood extra if you're using Polypore (which is what you should).