I think what you need to do before jumping into anything is to really focus on researching the market. I know it's not always easy when you don't have a firm idea on what you would like to sell, but it's important in this game to know the market well if you want to at least give yourself a chance.
Unfortunately, the days of just selling anything and making money ar long gone, now you have to know what you're doing. You need to be able to idnetify products where the market isn't saturated, then you need to know your competition and finally you then need to source those products from a reliable supplier abd a price where you can compete.
That really is the whole ball game in a nut shell right there and from what you wrote, I don't think you've really even made it to first base just yet, so I think you have some serious work to do to really be ready to give it your best effort, especially given that you have very limted funds that you don't want to risk.
Jumping in at this point would most definitley be risking your cash, no doubt in my mind whatsoever.
I think the refurb market could well be a good market for you on your budget, I don't think wholesale is really an option for you at this point. Once you have more cash behind you, wholesale would be something to look at then perhaps.
It does get overwhelming when just starting out, but that's not a reason to just pull the trgger, that is just a recipe to lose your cash.
The problem you would have selling on Amazon without using their FBA and using refurb as your supply chain would be stock control. Being that you're not in the US, you would have to import the stock from the US and then send it back on a per order basis, so hard to imagine any margin left at all after thos expenses, plus you then have the drama os strorage.
So you're really limited to either using a fullfilment service in the US of your choice or dropshipping products direct from suppliers. You're location and intended market location makes it quite difficult to see any other way. If you were selling to a local market where you are, then you could import the refurb stock and most likely still have margin available (depending on storage costs)
So you are in a difficult position with only very limited options available to you realistically. Makes it more important than ever to really focus on researching everything fro the ground up and not taking risks at this point.
Not sure if you are well versed on Amazon's FBA fees, but this link might be helpful to you if you aren't Link hidden: Login to view