The other thing you will have to do is to check the alignment. There are a variety of tools and techniques you can use. I would not try to do this until after you have learned other things and actually tried to look through the scope. If you can see a clear image then the collimation may be close enough.
but, this video may be helpful in understanding collimation. The scope he uses to demo is the one I own.
How to Collimate an Orion Reflector Telescope
https://www.youtube.com/watch?v=YAVGcGEBmCE
Here they really mess one up and then put it right
https://www.youtube.com/watch?v=8G98RTP6jbY
Collimation using a Cheshire Eyepiece
http://www.astronomyhints.com/collimation.html
Again, I would not worry about this until you have done the other thing. If you can get a reasonable image focused during the day then your collimation might be close enough for now. don't mess with it until you have done the other things.