The Title Says it all. I sucking playing the 2 main roles that go bot. AD Carry and Support. All i can do as AD carry is last hit minions and get assists. Every other time i just lose my lane. As for Support the only champ i go bot as if i have to support is mundo and just poke with my Q. Any tips or champ recommendations would be much appreciated

mundo? lol a support is a champ that can do well without much gold (ofc with a gp5 item and runes you will have gold, but most of it will go to wards)

mundo isnt a champ that does well on a budget, try thresh, hes fairly safe, as support remember to zone, start at support and watch good adc players and learn that way

just take it slow, despite what ppl say, support is prolly the most important role on the team, you provide key vision points, and babysit the MVP of the team early, when they arent strong

support is, IMO, the second hardest role to learn, behind jungle, but if you can learn it, youll have enough exp watching adc's that you can mimic them till you get your own skills haha

if u want some more help u can add me, i wouldnt have any issues showing u a few things in game, if youre not down with that, remember mobafire.com is full of amazing guides by high level players

(you can lolking me if u want, i have my bad days (like today), im by no means pro, but my knowledge of the game makes up for my mediocre skill, and i usually stay somewhere in mid silver)

Just putting my 2 cents in.

Adc is a very important role as you become one of the highest and most consistent damage dealers through towards late game.

ADC
-Of course you want to farm and harass but never put yourself in danger. If you aren't so good at farming, practice in a bot game or against a friend. Practice will always improve your skills.
-Try to be aware of the map and asks your support to put down a ward or two if you feel in danger or if there are none.
-You don't have to save your support if you can't. The enemy gets the same gold either way but if you're alive you can continue to farm, perhaps less effectively but you are still building your self up to destroy people in the later stages of the game.
-If you are losing your lane asks for ganks from your jungler, remember to be nice about it. They are more inclined to help you if you aren't being a demanding person. Understand that they need to farm themselves and gank other lanes.
-When it comes to teamfights, try to stay behind your teamates and dish out as much damage as you can without endangering yourself to a large extent. If you feel the trade is worth it e.g. you kill their adc and their apc and die in the process go for it. Otherwise stay alive and kill the enemy. Ideally your team would have a peeler for you who is tanky and able to stop the enemy from attacking and killing you.

Support:
-Mundo is not a great support champions, if you want to harass the enemy try playing sona.
-As a support you want to protect your adc and give them the easiest time possible to farm.
-You can do this by constantly harassing the enemy (remember to keep safe) or being a big threat e.g. being leona or alistair is a huge threat as these support champions can easily get to the enemy adc and lock them down while your adc kills them. You must do everything in your power to keep your adc alive, even if it means flashing into a nidalee spear and dying to save him/her. They are generally the biggest damage source your team has.
-Remember to always buy wards and ward key areas during the laning phase i.e. the two bushes in your lane if the enemy is using them to harass, tri-bush, river bush, dragon. Of course when the game moves out of the laning phase the areas you need to ward increase.
-When picking a support consider who your team is picking. Don't pick sona if you only have damage dealers in your team, pick someone like leona or alistair instead. If you have a lack of cc pick sona, lulu, taric or alistair. Those are just some examples.

If you are having a hard time understanding the mechanics of playing support or adc watch some streams by pro LoL players.

The first step to getting better at support is supporting with an actual support champ.