I'd get the mortgage making sure to have a LTV ratio that allows you to avoid paying PMI, which will pay off the mortgage if you die. I think they changed the rules these days that if you get PMI initially you cannot drop it after getting the LTV below 80%. Instead get some term life insurance on you to cover the mortgage if you die and lower the coverage as you pay down the mortgage.
As far as dividends I'd focus on companies that have a history of increasing their dividend payout. AAII has a dividend investing newsletter you may want to check out. It's cheap. Also, some companies with great dividends are very pricey as people piled into them looking for yield in the low interest rate environment. Those cold be painful as interest rates climb.