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Basically the bigger aperture the more light you can collect. Dobs are fantastic for large aperture versus price but are not best suited for photography. For photography you need something that can track the movement of the object through the sky.
You need long exposures to get sufficient light. You wont see colour with your eyes as it only comes from long exposure images. Binoculars are good but again more aperture = better, more detailed views.
Personally i would leave the photography for now until you are willing to spend big money and start out with a 10 or 12 inch dob. The views will leave you speechless and with it being a non guided scope you will learn the sky as you go.
P.S welcome to IIS
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