need advice/ feedback

I like to main support. My two champs I use is nami and blitz. I ussally let my team have a say on which I chose to play to get everyone talking early. I like these two champs because if I don't get my support role i can still use those champs in other lanes. Now if I get jungle I usally pick yorick. Now here is my first question is amumu a better choices for jungle? (If so I will start learning him...) or is there a better overall champ for this role I should consider? Now for my second issue is like I said I like to mane support so I now what a good adc should be able to do... but that doesn't mean I know how or able to do it well. So with that being said I dont play adc..... yesterday I almost got stuck with adc. Which almost never happens.. my question is should I try to learn to play adc or just try to focus on the other 4 roles I am at least half way decent on? Thanks for listening and look forward to advice.