There are a number of homeopathic training establishments around the world. Each establishment has its own entry and training requirements, however it always good to do some research and find a reputable training establishment before parting with any money.
At a first instance, you should check that course providers are endorsed by the relevant authorities in your country. This will ensure that you will be able to register on graduation and inevitably practice legally.
In the UK, you could check with the following authorities: