So a few friends and I have just started doing TT. We have played a few non ranked games, and are 2-0 in ranked atm. Our general strategy for deciding composition is as follows:
-We must have a tank, an AP, and an AD
-Our AD and AP must be 1 range and 1 melee so that they cannot just aoe down our damage dealers
-CC is a must have for our team. We require at least 2 stuns, knock-ups, grips, or anything else that will cancel/suppress something like a Katarina ulti. Therefore we do not count slows.
-We do not currently use a jungler due to lack of knowledge on jungling routes and champs for TT, but one of our players is working on Lee Sin jungle on TT.
- Ex: Our two ranked comps so far were Anivia/Jax/Garen and Diana/Miss Fortune/Malphite

Overall, is this a good strategy? Is there anything that we are missing? And who are the best jungle champs for TT?

Try to grab the jungle buffs whenever possible after around level 9 and ward dragon as soon as it spawns. Once you get it to 2v3 (someone on their team died) attempt a dragon ASAP for an extra 2 kills worth of gold

Okay thanks for that, but I am really more interested in team composition.

comp wise pick high cc heros and have at least one ap and ad the third doesnt matter
as long as all your heros in the comp have solid cc its a good comp
its definatly a good idea to have one ranged, but unless you are a really good ADC they are just too squishy for the map in low elo so stick with ranged casters
example: morgana chogath riven
wukong lux shen