Rhubarb crumble

I live in wakefield which said to be the capital for ruhbarb, so I thought that this year i would give making a ruhbarb crumble a shot, never made it before so ill need some advice, do's and dont's so to speak. Any help would be gratley apreciated 

Thanks, so I dont stew the ruhbarb first, I just put it all into a caserole together?

That's an interesting variation as I have never made a rhubarb crumble without cooking the rhubarb first (usually in the microwave), I will give this method a try 

tell you what, i seem to fancy anouther crumble that one was that nice  , im thinking about making a plum crumble but there isnt a recipe on this site (well not one I can find),any suggestions an dos and donts again, sorry, im a complete amatere cook 

Apple is versatile in crumbles, with blackberry or one of my faves apple& mango with a hint of crystalised ginger. Or with dried fruit , apricot,date,raisin. The recipes are very much dependent on your own taste whether you like the fruit tart or sweeter.
I just cook a trial batch of fruit mix in the microwave to see if it tastes right and use the same mix next time with the crumble top in the oven.