tips are alwayse good but everyone rolls a little differently,

the only thing i can think of is practice, its the best way to learn.
it can be really frestrating but it really does help. i got good just
rolling my own cigaretts for a while, if you dont smoke cigs just
try rolling it and if it doesnt work dump it and start over.

my friend has a trick where he puts the weed in a zig zag and folds a dollar bill over it and rolls it into a copmact weed bar, then just roll it up, lick the gum and stick it. also dont get the gum too wet or ur joint wont burn as well

hope this helps