Any amount of money can be used to start trading. Just that your goal should be clear and limited to bitcoin mostly. Day trading less than long term and not going into HYIP/MLM/Signals groups should keep you the safest.

Go with any of the more risky options available and you will be increasing your risk. Depending on your risk appetite, you might get washed out too quickly, but as you gain experience you will able to develop your skills.

I dont see the point of "alone" here. We all trade on our own, nobody should be guiding you unless they are a family member teaching you and has good intentions.