If you have some light body,it may help you,probably you already know why: you might be more flexible with a light body.
Agility too,it's something you will need
Try to practice in a place wich have a smooth ground,such as sand,grass or even above a mattress,it may avoid you of having some problems if you fall.
Of course you later must do it on common grounds wich have concrete,rocks etc.
Practice is basically what will help you the most,good results come with some training.
It's basically about it,keep training and with time you will be good.
Also,don't hesitate in asking for professionals/more skilled trickers,they will give you more information and will make some critique to help you.
to start,you can try the easiest one: a backflip,after you "dominate" it,you can go for other tricks such as corkscrew,butterfly kick etc.