What I mean by decent is where you can really see that it is growing and it can give you profit that is enough to be reinvested.
Call me dumb but I really don't know. I'm sorry.
My only source of coins is my signature campaign. I earn about less than 0.1 BTC per month.
Any advice would be much appreciated.
depending on the amount of profit that you can possibly make in trading i say somewhere between 0.5-1
BTC is going to generate enough decent profit for you to be happy about.
but if you want to start that is a completely different story. because as a starter you should only think about the profit not the amount of it.