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are there any army lists for exodites, i mean like a codex, I want to start one cause I like mdelling challenges, but I have no idea what I need to make?
Currently there isn't an up-to-date codex, but two generations of codexes ago there are entires for exodite units, from the top of my head dragon riders or something along those lines were included. Try asking gamesworkshop to see if they have a copy lying around from those days, but everything you need to know fluff wise is included in the current codex.
Of course if you want fluff, you could model exodites and use existing units like Gaurdians to represent basic troops or Vypers modeled like the old Siam Hann Special Character as dragon riders.
For all the info youll ever need on exodites, goto Agis Page of miniature painting and gaming - Codex Exodites - Showcase
Also, you can use dragons and the like in any standard eldar list. Eldar riding small dragons for instance can be used as jetbikes or shining spears. Large dragons can be falcons. All you need to do is model the weapons and make sure your opponant knows its not 'really' a dragon.