It depends on what you want to get out of gathering.

If the goal is to make it easier to dabble in crafting later on, then the next step is to level miner up. You can get away with skipping fisher, as most fish are useless and there are enough non-fish CUL recipes to get by(though if you enjoy fishing do that too). But miner is another story, as far too many recipes require a hard or soft metal(especially when looking at BSM/ARM/GSM who make items used by many other classes) or some other mineral to skip the class. You can use leves along with GC turn ins to get miner up quickly(plus any old gear you might still have lying around) so that when youre ready to craft you have the ability to get everything yourself.

If the goal is to make money, you're in good shape now. Gathering is the easiest way to make gil in game. Do a little research at the market board to see how your server sits, and go out and get some of the things that sell well and often. And the key is the combination of a good sales price, and a lot of people buying. You dont want to have a stack of wood that someone buys once a month for 1 mil, you want to find a stack that sells once an hour for 25k(these numbers are just examples of course). Some mats people prefer HQ, some they only need NQ. This is what your market research wants to uncover. And if you want to get advanced, figure out how many a crafter is likely to want at a time and you can sell in smaller "perfectly sized" stacks and often charge a little more. If the suit of armor i want to make(but am too lazy to go mining up the ore for) requires 20 ore, i might very well pay more so that i dont have any left over when im done. This money can in turn be used to upgrade your gathering equipment(or whatever else), opening up more materials you can go after(making more money, for better upgrades, etc).

If the goal is to be the best gatherer you can, then you will need to learn collectables. At its most basic, you're using appraisal skills(most stick to impulsive and methodical) to raise your quality, then collecting the item(s) to turn in. Kinda like how crafters build up quality, then finish the production. Learn how Utmost Caution, Discerning Eye and Single Mind interact with each other and with your appraisals to get the most out of them. The easiest way is to practice. Look at Rowena's menu, and see what kinda collectables she's after for BOT. Go for one of the common materials(zelkova or something), and just spend some time practicing with the skills until you can get high enough to turn in(we use common mats to practice because theyre always there, timed node mats pay better but you dont want to "practice" on something that wont respawn for an hour). Once youre comfortable with this, do the quests needed to unlock Custom Deliveries. Later on you can use these for your crafters, but for now you can do 12 weekly turnins which should net you a decent haul of red and yellow gathering scrips. These can be used to upgrade your gear, or to make a quick buck if youre broke.

If none of these are your goal, then... what is? Let us know, and we can give you some guideposts in the right direction.