First challenge advice? I've never really looked into challenges until now and am realising I should probably start doing them. 

I'm not really sure which I should start with although I was thinking maybe 1000 years? Also don't know if I should stock up in certain resources like TCs and relics etc beforehand.  
Right now I have 1806 paragon, 2830 burned, 41.59k TC, all metas up to malkuth and I haven't bought any chronospheres in this run yet. 

Basically what challenge should I do first and is there anything I should know or do to prepare before I start?