It's easy for me to say because I have done it on extra characters... Guess what I do have gil but at the time all of that gil was for me not my mule so that doesn't apply.
Here's the secret since you can't figure it out.
1. Start the game, pick your race, and pick your job (the first one you pick doesn't matter as the items they give you are trival at best)
2. Switch to MNK, why? Because it's easy to pound on monsters and you don't actually ever need a weapon for 1-30, don't get me wrong weapons and armor help but not much at this point.
3. Level up to 10-14. Make sure to use
Fields of Valor or
Grounds of Valor pages as you'll get bonus EXP from completing them and once a game day you'll get gil and tabs. I recommend Grounds of Valor personally as it scales up the EXP/Gil/Tabs.
4. Make your way to Gusgen Mines (Page 1 from the book btw). If there aren't people actually there leveling (odd but happens) then head back outside to highlands and grind away until 16-18 range then go back inside as you can solo the skeletons now, and beat up skeletons until 26. You could move further down to hit 30 but it becomes sketchy on safety at that point. Once you're 26 you can shift over to several different locations, check the FoV/GoV links to see what works out.
5. Now that you're level 30 you'll notice a few things: You're gimp but that's ok at this point pimp doesn't matter. You have no sub job (find the quests (hint: search "sub job quest") on the site I linked for FoV/GoV and you'll be on your way. Here's the cool thing now that you're level 30 MNK you can go do all of the advanced job quests that you want, with the exception of SCH (sort of) read up on the jobs from that site (gamerescape) and you're good to go.
6. Let's say your goal is making gil fast then your 2 jobs to unlock and focus on are Dancer and Beastmaster. Repeat steps 1-4 on both of those jobs.
7. Now that you have Dancer and Beastmaster at 30 you can leech them in Abyssea. It'll take you a few hours to hit 50 level cap. If you got Dancer to 50 and don't plan to level it to 99 at some point you can forget about that job as it is ready for a sub job and can focus on Beastmaster.
8. Again refer to gamerescape or any good resource you prefer for your information. With info in hand so to speak complete the limit break quests and return to leeching in Abyssea. Note: thanks to a lot of changes SE has made excluding the final limit break quest you can now solo all of them.
9. Congratulations you now have a level BST95/DNC47 which is more than enough to start farming Dynamis. Here's the catch you need to do missions to gain access to Dynamis as all you've done up to this point is level up jobs. Again refer to whatever source for info you want. Also you'll have to skill up axe which is fairly easy to do especially on BST since you can make your pets do all the tanking allowing you not to worry about keeping your HP up.
10. Congratulations you've gotten access to Dynamis and can begin making 1mil+ gil 2hours out of every day.
So ya it's easy for me to talk not because I have an established character or friends but because the game is seriously that easy to play if you aren't lazy and spend time researching instead of crying.