Hi Greg
and welcome to IIS
You'd be well advised to read any/all of the half dozen or so similar requests from newbies in the past week or so.
The advice would be the same for you. You need the collimator, - quite right. Also, a 2x Barlow would be a great accessory. That will make your current EPs into 5mm and 12.5mm. The 5mm will be great for viewing Jup and Saturn when they're viewable and seeing is good, as well as more mag for the moon detail. Although be prepared to move the dob around a bit as it'll move quite quickly across the fov.
Other accessories would be a Planetarium, a red light torch, and an adjustable seat, as viewing through a dob can be quite back-breaking work!
The only filter I'd bother with at the moment would be a moon filter. If you look at the full moon without one, it will ruin your night vision for about 3 months
How's that for starters?
Cheers
