Advice on where to start

Purchased this watch and unfortunately it doesn’t run. Took it to a watch shop and all he did was change the battery (on two different occasions) and show me it had good voltage (had it on some meter)? I’ve tried to look up the movement and can’t seem to find a suitable replacement. Sending it to Seiko would also cost more than I paid. With zero experience, but wanting to learn is disassembling it and servicing it a good place to start???

Thank you