It's best if you can find one skincare range that you like. There have been loads of threads from different geeks asking what to use, if you do a search you should find a wealth of information.
Most skincare companies do their own product training to show you how to get the best from their particular products. I know Dermalogica do this if you are a stockist but their startup costs are pretty high. Do a bit of research to find out what will suit you, your clients and your budget. Most companies will send you an information pack and samples to try.
Happy hunting!:green: