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I concur with the idea of getting a finder for you telescope. But I'd follow the other suggestions and get the red dot finder working and leave it there also.
If you had a straight through 6X30 or 8X50 finder, it's easy enough to locate brighter stars initially by keeping both eyes open when you line up (it's much harder with just one eye open, the way one tends to want to do it, like in aiming a rifle). But there are lots of times where there aren't many bright stars near what you want to observe, or where there are too many, creating confusion. In those cases, it is a lot easier using the RDF first, and then the optical finder.
What I like best is having a RDF with a right angled, Correct image finder that matches one's star atlas.
Very strange about the Barlow, I've never heard of one that doesn't work in a reflector. Generally speaking, the longer ones are considered the better ones, with quality sacrificed slightly in the "shorty" ones, which people don't mind as they are handier to use in telescopes with star diagonals. Also, I'm not sure what is meant by "long" as I have a pretty long Televue one, shorter Televue and Celestron ones (which I still think of as standard long), and a much shorter "shorty" Meade one.
My only eyepiece tips would be that it's nice to have eyepieces that match the size of the deep sky object you are trying to observe. With 1.25" eyepieces, 32mm gives you the widest field - don't buy a 40mm one, as it gives the same field of view. But if you have a 2" focuser, then 40mm does give you a wider field, as does a 56mm eyepiece.
Initially, when viewing the brighter objects, your current collection is fine. But later on, as you try hunt down faint galaxies at a dark site, an eyepiece that gives you a 2mm exit pupil is usually best. Basically multiply the focal ratio of your telescope by 2 to find that eyepiece. So if you have a focal length or say 900mm, focal ratio is 900/130=7 and you'd want a 14mm eyepiece, or the closest you can get to it.
And to make life easier for yourself, try make that 2mm exit pupil eyepiece a wide angle one - it doesn't have to be an expensive one. The inexpensive ones aren't as good at the periphery of the field, but faint fuzzy galaxies will still be spotable there.
Regards,
Renato
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