How do i create the best competitive and for fun combos

[font="Source Sans Pro", Helvetica, Arial, sans-serif]I'm new to the burst series I used to have tons of the old metal fury and so on I'm trying to come up with competitive and fun combos can I pls get some help with this iv got world sprigan , astral, sprigan savior valkary, greatest Raphael, Belial, guilty Longinus and a bunch from the Hasbro brand I do plan on purchasing some of the old metal ones from Beyblade premier eventually tho too.  iv also got the achiellies booster coming as well.[/font]
First is a large variety of factors, what type do u want,which armon do u wanna use,and what launcher will u need because some only work with certain launchers