UK grower

hi,i plan on growing outdoors.i live in UK which sucks cus its freezing lot of time. i plan to put them into the ground somwhere deep in the fields that i live near. has anyone got any tips for me? exspecilly with preventing mold 'n' shit, this is my FIRST ever grow, and i hear that hardly anyones first ever grow goes well. but i want it to grow some bud that i can smoke. i realy do... will i need to water it myself? Or will mother nature do that for me? and what in general do i have to do? and will bugs be a problem? i need to know all the MOST IMPORTANT things to do when growing outdoors in cold conditions

thanks