Well, there is a bit of information that you need.
As for organics, autopots work best with an organic setup, in my humble, but unlike with salt nutes,
you do not put organic fertilizer in the reservoir. What you do is mix up a soil that is rich enough to feed the plant with only water from the reservoir.
@pop22 is the grower for this style - he grows some really nice plants with nothing but water from the reservoir. If you put organic fertilizer in the reservoir, it tends to plug up the tubes and valves, a particular problem if you leave home for a bit - bad things happen when lines plug or valves fail to operate properly. One slight downside to this soil approach is that it works best when you have time (as in several weeks) to "cook" the soil mix (poor term, aging might be more accurate, but "cook" is what growers will say that they do to their soil mix). I know that
@pop22 suggests that with smaller quantities of soil you can get away with shorter "cooking", but I can't advise on details, maybe he can jump in here to help. If you can go this route rather than coco, I think your grow might be a bit less risky.
The other option is salt nutes. One of the simplest options is single part MegaCrop. A bit fussier is the two part MegaCrop, but the upside is that
@Mañ'O'Green is working up a nice feed schedule for two part MegaCrop that would help you. Either will work fine as long as you keep your ppm/EC and pH under control. There are quite a few other options as you will see by browsing successful auto grows here. Another line that I like is Jack's but I think since you are new, you might be better off to just go with MegaCrop. I suspect that the two part might give you a bit better control, particularly with coco, but you may be happier with the simpler approach. All considered, the latest version of the single part MegaCrop might be your best option for now. If you continue with this mischief, you can consider other options once you get a few harvests in the cupboard.
I am not sure what you mean by flexipots - the Autopot system include Flexitanks, and the fabric pot option includes SmartPots which are a decent quality fabric pot. If you are ordering the single pot XL system with smartpots, that is what I use unless I want even larger pots, in which case I use a different DIY tray setup. You can see what I did with larger pots in my current RotBlock test grow:
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The larger plant on the left is in the standard xl Smart Pot that comes with the single pot XL package from Autopot. The three runts on the right are in ~10US gallon fabric pots sitting in a "tray" that is just some 6mil polyethylene supported around the perimeter. The autovalve is out of sight between the closest two pots. The copper mesh is to deter slugs which otherwise chow down on the leaves.
If you go with coco, you should spend some time over at Cocoforcannabis.com. There is a lot of good information there, and some of it is quite important. For example, coco needs to be buffered, so you need to know whether the specific product you have is buffered or not. No biggie to do it if necessary, but you need to know. Unbuffered coco locks up Calcium and Magnesium and to some degree iron, and can cause all manner of mischief as a result. Whether your coco will need more calcium or magnesium than is supplied by your nute package is uncertain. Both current versions of Megacrop have quite a bit of both already, so you may get away without any extra. However, having both plain (no perfume) Epsom Salts and some CalMag on hand could prove helpful.
All considered, if I were you, I would grab a small bag of MegaCrop, some Epsom Salts from the local pharmacy, and a bottle of CalMag. Have you bought your coco yet? If so, does the information for it specifically state that it is rinsed and buffered?
Keep the questions coming, we will get you sorted out!
