*****DISCLAIMER: MY KNOWLEDGE IS BASED ON INFORMATION FROM 6-7 YEARS AGO, BUT REGARDLESS, THE FUNDAMENTALS REMAIN THE SAME*****
First Day Ever... Money Making Guide
1) Mobility is Key. So your very first thing to do is to go around the world and activate all of the Lodestones.
2) Grand Exchange. Do the Tutorial since we will eventually need it in our Adventures to come.
3) Safety Stronghold. By going through the Safety Stronghold you get 2 Items that are useful at very low levels. GP and Safety Gloves. (They provide combat bonuses, at level 3, you can't beat it.)
4) Stronghold of Security. By running through this and getting to the Cradle of Life, you will get some much needed GP and you will have your pick of Combat Boots or Fancy Boots. (It doesn't matter which, they provide the same combat bonuses.)
5) Lumbridge Training Grounds. Free exp. If you complete all of the tasks with full marks, you can use the exp lamps to level Range from 1 to about Level 27. (It's the same for any of the Combat Skills.)
6) Fish and Tackle Shop at Port Sarim. You should have about 15k GP from the Safety Stronghold and the Stronghold of Security. So buy the 1k Feathers that they have at the shop. (They replenish every day for you.) Go to the Grand Exchange and cut some Trees down. Start making 1k Arrow Shafts. Fletch the Arrow Shafts into Headless Arrows. Sell at the G.E. (Yes, I know this is a Members Skill but NonMembers can still train it to Level 5.)
7) Kill Cows. The Wealth that you can accumulate at low levels by KillinCows is simply hard to pass up. If you wanted to you can train about 3 or 4 different skills by the loot that you receive by KillinCows. If that doesn't interest you then you can sell all the loot at the G.E. (You can tan the Cowhides in Al Kharid for free and sell the Tanned Cowhides for even more.)
Well, that is all I can do for the short amount of time that I have, I will keep adding to it hopefully in the days to come. Good Luck out there!
-xKillinCowsx