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As a low level you can easily make some decent gil right on your own outskirts through various mobs and methods.

If you're starting out in Sandy, concentrate on rabbits, bats, sheep and orcs. Rabbit hides stack and can be turned in 3 at at time for a repeatable quest that yields a handful of gil and will get your fame established. Also bat wings are used for a repeatable quest and yield 200 gil for every pair. Sheeps can drop meat and skins in plentiful supply and the skins can be crafted into stackable wool which quite valuable on the auction house. And orcs well, they always drop gil anyways, and it doesn't hurt to NPC those orcish axes and scrolls you don't need. And if you're extremely lucky you'll have a chance to claim the NM Jaggedy-Eared Jack. Good luck with getting the drop however, it's extremely rare.

For bastok, making runs around the various hills yields great gil potential killing bees and sheep in particular. Same story as above with sheep, and bees drop beehive chips and honey with decent drop rates. Not to mention killing these will give you a shot at the NMs Stinging Sophie and Carnero if you wish to obtain a Beestinger or that level 10 Great Katana.

Windy probably has it the best for low levelers. Crawlers have the potential to drop silk threads which are ever so popular and valuable in stacks on the auction house; these also can drop their little bowel stones which can be handed in at a repeatable quest giver 3 at a time for 600 gil. Along with crawlers you have bees for the same yield mentioned above and a chance to claim NMs such as Tom *** Tat and Spiny Spipi for a possible Mist Silk Cape and Fruit Punches.

Hopefully this mini-guide helps out. If farming isn't your forte, one can always try fishing for a more mellowed pace of profiteering.