Does the tube have any altitude bearings on it? Or holes for them? I suspect this may have been once associated with an equatorial mount to which it would have been mounted with a set of tube rings - but they are not present as well.
Look at the photos of the GSO dobsonian-mounted telescopes and that will give you an idea of the type of bearings you need to fit to the scope. If you can make them on a set of rings that go around the scope, then you can loosen and slide the tube up and down a little to find the right balance point. Check you leave enough space underneath so the scope can be swung to vertical without hitting the bottom of the base.
Just get started with the supplied eyepieces to see how it goes.
Re collimation - it's pretty straightforward. If the primary mirror is not "centre-spotted", you should do that before you mount it in place. Just search "centre spotting mirror" or similar and you should find some "how-to" guides with photos. Best to put one of these ring binder reinforcement rings in the centre which allows easy use of a laser tool (hmm - but they will all be 1.25" dia or larger?). OK, just a texta spot will do for visual collimating - it can be a "chunky" spot so it's easy to see - not a fine dot. Don't worry about the middle of the primary mirror. It is under the shadow of the secondary mirror and contributes virtually no light to your image at the eyepiece.
Why didn't the picture work out? Couldn't ake a god one or couldn't attach to your post? How about a few pictures of the scope and focusser - pictures really help people to comment and suggest.
Cheers, Eric
