I have used UK, French and Spanish companies to create coins and the best was the Chinese. All you need to do is have an idea of the design and then want then go on www.upwork.com and find someone. the art will cost you between 50-200 bux and for the sticker about the same. So thats like 400 BUX gone.
WHAT NOT TO SELL
If you want to make brass coins DO NOT DO IT its a total waste of time and money and you will be worked to your bones for simply nothing.
WHAT TO SELL
You need something catchy here that minimum 10% of people will really like. Because when those people like it they will involuntary display their interest. If you can you ALWAYS do gold and silver coins and you charge 40 pounds - 300 pounds profit per coin
How to Maximise your Profits?
Easy and they public fall for it (sorry the people reading this) every time. You need to make 90% of your coins in silver and 10% of them gold. But have both with a serial number 01 which means the collector bids for 2 coins. Also 2 coins per year and if you do fund them get some local certification so people can believe. If unfunded then just milk the audience like everyone else does I never milked the cow I just took away the bucket for a small fee.
Who To Avoid
Mitchel is a cool person and through my time has helped me a lot but recently he said I am a scammer and he will not answer a PM. Bitenvy is a psychopath I would stay clear of unless you have very clear terms and conditions before the sale. BG4 will claim your coin is too expensive and try make it look bad so he can get it cheaper. BUT there are lots of cool traders like monkeynuts, blazed, halo, zeroxal, MRBONG411, OGNASTY, LOts of others..... If you PM me with names I will tell you if I had issues.
If you do this right you can make probably 20k usd taxable per year easy