Lottery Bonus Ball Question

If you have a works bonus ball game where everyone has 1 number what are the odds of you winning for 1 week?

is it a simple 1 in 49

or do you have to take into account that for you to win you your ball cannot come out in the first 6 balls?

Also what are the odds of you selecting just the bonus ball if you pick say the number 7 for example. so you can'tcome out in the first 6 numbers