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Gustavo
Firstly that wasn't a long post!
As regards your question there are a few issues to cover. You will find that visual and imaging have very different requirements and dobs are usually quite limited for imaging use. Thay can be used for targets that require short exposue which would be the brighter targets eg moon, planets and sun (with appropriate filters!!!). Usually it is not possible to attach a camera as the focal point is inside the focus tube so the primary mirror has to be moved up the tube. You can do afocal which means holding a camera up to the eyepiece and using autofocus to focus and snap away. Takes a little practice and works best on the moon.
For deep sky stuff you need to mount on an EQ mount that can take guiding. Platforms for dobs can work but are not capable of being guided.
Guiding BTW is different to tracking, tracking means a scope is turning with the sky, guiding means you use an autoguider to correct any small errors in the tracking and allows much longer exposures.
The problem you may have is that a collapsible scope is not designed to be mounted on an EQ mount, so may need to handyman work to get it going.
Malcolm
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