Hi Kelly,
Keep in mind that I am in New Zealand, which is worlds apart (in many ways) from the UK as far as what is available as far as training and products. Nevertheless, I will give you my .02.
Call around. You will get a very pro-creative mindset on here, its a given, and thats fine, as long as you don't let that dissuade you from doing your research in an objective manner.
Talk to people - such as you are doing here but also in real life. Go into local salons and explain what you are wanting to do and some may blow you off, but some may actually talk to you and give you advice. Not going to know unless you try.
Do your research - with both EZ Flow and Creative you get your kit as part of your training, so you'll have product included, not a seperate item (some others may do this, but I don't know as I've no experience)
You CAN and SHOULD ring around to various training providers and trainers to see if you CLICK. I can tell you from experience that you can accomplish a lot with a telephone. If you ring someone up and they don't want to talk with you and provide some productive input, I wouldn't shortlist them to give them my money. Do keep in mind that if they are busy, it may take them a while to get back to you, so be patient as well. Email is sometimes the better option, but make sure you make yourself very clear what you are asking and what you want from your training.
As you are in the UK, you have many more options than I did here. Use that to your advantage.
Good luck with your research!
Nancy