How do i decide to ride regular, goofy, or mongo on my skateboard?

ok so i snowboard and i thought id give skateing a try. so my friend was hellping me learn a bit but i cant figure out what stance to use. on my snowboard i ride goofy and i can do tricks and stuff. but when i skate and ride goofy its very awkward for me to push but i can almost do an ollie. when i push regular it feels easier, but its really awkward to try to ollie. my friend told me to try mongo but thats quite difficult too.. so i really dont know what to do and i want to learn to street skate. someone told me to long board but i want to do the tricks. so some help would be really nice! :)