Welcome le.clark!
The 150mm reflector you bought will be a perfect introduction to a great hobby.
Your very first telescope can be a bit daunting to use your first night out. The field of view is very small; you've got to get use to directions in the sky; an astronomical telescope shows things upside down (you move the scope one way and the object you're looking at goes the other way!); you've got a finder that needs aligning; knobs to twiddle; eypieces to put in. Somehow you've got to do all this in the dark!
I recommend that you set up the telescope in the daytime and look at terrestial objects - the hills in the distance, mobile phone towers, the weird people down the road, etc!
It is a bit easier to sort out the issues in the daylight than at night. You can align your finder on an object in the distance, move the scope backward and forward, up and down, practise putting in eyepieces and focussing. It doesn't take much to get use to all this - it becomes second nature - but there is a little bit of a learning curve.
Let us know how you get on. There are lots of people on this forum who have been exactly where you are right now. We can take you step by step through all of the issues.
Adam.