You should use what's provided!
In most cases you will be given profits or cashflows which you can use. It wouldn't be much more complicated than that.
In general, you need to go the furthest possible. So, if they provide you with figures that would allow you to calculate EBITDA, then you should!
Also, don't forget that growth rate needs to be considered! If a growth rate exists, you need to subtract it from the discount rate.