Same for us for newcomers, especially young ones (without a proper job). Basic stuff you need to buy at the beginning is some shirts and shoes for example. I won't give you an exact "price" for the equipement considering it depends. It depends if you buy it through a mutual order in your group, if you know a good tailor, if you buy it from a retired reenactor...
If you insist, in euros, you can count around 900e for a decent musket (very important to not buy some pakistani shit which will blow at your face) and often 400e for an habit-veste (this http://i20.servimg.com/u/f20/11/08/03/09/06-51411.jpg
But as Olafson said, don't think at the prices, if you have the motivation, enlist in a serious group and they are used to beginners, they will lend you everything and each year you will buy a new item
Even some groups propose a 0% loan, so you will have your equipement and will pay 50e/month for 20 year :p