FBA vs. FBM for Selling Used Items

Hey all. I just moved into a new house and I have a lot of used items that I do not need anymore. That being said, I want to re-sell them, but am unsure if I should go for FBM or FBA. Also, if I only plan on selling sporadically (i.e. I am not going into business selling things on Amazon), should I do the $0.99 per item or $39.99 per month plan, considering that all my items might not sell in the same month. Any and all advice would be greatly appreciated.