With regards to price, I wouldn't do a free Bridal trial (that's just me though). The thing that I was worried about was that you would do the trial, use your time and products, and more than likely travel to them, all for free, and they might not even book you on the day. At least if you charge for the trial you can cover your time, some product cost and cost of fuel. I offer the clients a discount if they book me for their wedding on the day of the trial, which I find a good incentive.
I have done a couple of trials where the brides asked me loads and loads and loads of questions about techniques and products and I was with them hours, they booked me for their wedding day, then cancelled a couple of days after the trial (I think that they had all the info they needed), so it made me glad to have charged for the trial, to cover my time & expense. Remember, you are offering a professional service, so it's worth paying for.
Also, brushes are a major investment, I keep adding to my collection, decent brushes are a must!
Good luck hope you enjoy your course :lol: