2nd hand Spectra, get a portable one or handsfree?

Contemplating whether to get a 2nd hand Spectra S1 but buy new accessories (is it cheaper that way?), get a portable one or handsfree. Help! First time breastfeeding mum and I know nuts! If I want to buy the 2nd hand Spectra S1, just the motor & charger, where can I buy the accesories? I am really a noob. Appreciate if you have any link. Also how to know what size flange to use? 🙏