I started off with a color astrocam and moved to mono within 7 months. But, I had no prior experience with AP beforehand.
To use monochrome, you need filters, most people get SHO + LRGB, but you can leave Sii out if you're pinching pennies at first.
I personally would advise going mono but, it depends on your budget, it is better that OSC in every way for the majority of non-galaxy DSOs. And for broadband targets, you have LRGB.