You need to call an insurance company for quotes, start with your auto insurance company & go from there. There are many questions, what does the master policy cover? You would need to read the condo bylaws to find out. Does that policy cover everything attached to the unit or only to the studs? Does it cover anything that you add to or alter in the unit? So, you would purchase a condo policy (HO6 form), you would need to find out from the condo association what you actually need to cover. That would be the dwelling limit you need. Then you need to tell the insurance company how much contents coverage you want (if you had to replace everything you own), then get at least $500,000 liability, $5,000 medical payments & get $50,000 (or the company maximum) loss assessment (this covers if you are assessed for damages to common property – simplified definition – you would need to speak to an agent to explain it to you). You would also need to tell the agent the deductible you want (property coverage).
Good luck in your purchase but no one here can give you a quote.
Homeowners insurance is always an annual policy.