Yes, the i5 is an all round faster and better cpu than your A10.
If you’re not looking to do a full upgrade for a while then I’d say yes it’s worth getting a motherboard for. It will be hard to find stock due to the age but if you’re on a budget constraint I’d go for the cheapest you can find from one of the main brands (Asus, msi, asrock, gigabyte) that meet you requirements for sata ports for harddrives, sound output etc.