KojiSan
what about sharingan. he asked for knowledge of chakra and eternal youth. If you have something then use it. Then there is using Madara's fighting experience to train fire bending which is not ideal tran the taijutsu while increasing chi and chakra pool along with chakra control after perfecting them fire bending will be much easier since Madara's primary chakra nature was also fire. That's how I would have done it, that's what's best for the long term. Know that Madra has been fighting in wars since young he not only just have knowledge from konoha Uchihas are one of the oldest clans in Naruto world.
Madura taijutsu⊠could fight army Guy and gods⊠here⊠is affraid of takes 10 peps that trained for year⊠sigh⊠this is going to be a long and painful read. 1 year and he didnât try and experiment with chakra techniques or anythingâŠ. Discovered he could stick on walls at the very last moment and is conveniently taken to an island by a fish⊠now add the fact that we know other reincarnated are coming⊠this is checking all the wrong box for a horrendous read