Hi Tas,
Your off to a good start!
4.5" Newt. I'm not laughing. 20 years I had my 4.25" Newt and I loved it. I have only stepped up to a 12" a year and a half ago.
You will probably catch apature fever like many of us, but for now be content with what you have. Some better EP's would help.
Check out Astromans astropics to see what he is achieving with a 4.25" Newt!
The best part is you are sharing it with your son, no matter what you use.
Take your time and learn what is available, which scope suits your style of viewing (planetary, deep space etc) and try get to an Astro Club and try some out.
But for now, enjoy what you have and enjoy the precious time with your son! He won't forget.
