New Job in Brussels - how much will i really earn?

Hello friends :)

I've been offered a new job (my first real job after graduating) in Brussels which I am very excited about!!!!!

However, I have some questions about the salary/taxes etc! I'm single and will be living alone (ie not married or with dependents)

OK so the I will have 2400€ per month (13.9months)
plus vouchers for lunch

So what will my take home pay be after tax/social and anything else i don't know about?
Also, what is the average number of holidays received in Belgium?

Thanks in advance for your assistance!!!

Mich