"Can't promisse any money at start, but we would share agreed percentage on the finished products"
I really think you need to rework your business plan before you take someone on board to make stuff for you. If I was a candidate, that kind of phrase would make me run away faster than a speeding bullet. IMO, it's either you pay them upfront for their work or it's nothing. Because, as you said, it's risky and you've not shown that there is market potential for these kinds of products. So if you do happen to take on some talented person on an agreed percentage, and the business flops, that talented individual has worked hard and wasted much of his time for diddly squat. After all, it is your dream, not theirs.
For most airsoft/robotics projects, python should be adequate and there are a lot of free learning resources out there.