In terms of whether or not what you’re doing is the correct way of doing things, I’m afraid I can’t help there as I’m not an accountant. There are a few on the forums who may be able to comment, or alternatively you could send a query through your dashboard (there’s an option in the top right above the ads). Alternatively, may be best to check with somewhere like Accounting Web?
Anyway, onto the part I can help with! To run payroll, you quite rightly say you need to sign up to a payroll service like Payroo or The Payroll Site. QuickFile does link up with The Payroll Site, so this option could make things easier for you.
There’s a guide for The Payroll Site here:
http://community.quickfile.co.uk/t/the-payroll-site-setup/8984
To record a payment of a dividend, check this post out:
http://community.quickfile.co.uk/t/how-do-i-pay-a-dividend/5173/4?u=qfsupport
I hope that helps!