Do moisturise first, but don't apply yr base straightaway. Do ask advice at make-up counters (eg, Boots, Debenhams, House of fraser etc). Ask for samples to take away, if they won't give them, don't buy anything. I once read that in a magazine. Colour match is important too. I've bought foundation on recommendation from these counters but these are matched under artificial light, when you're under natural light, they don't look right. Foundation is the hardest thing to buy. Good luck!!!