All my sourdoughs are flour water and salt..that's it!
100% rye is a bit tricky because it doesn't behave like wheat, it doesn't absorb water so well but you need a fair bit of water otherwise the end result is like a nice smelling brick..
Depends on your starter but I would make a mix of starter and wholemeal rye, let that get good and active then use 70/30 wheat to rye so you have a chance of handling it (working with rye is always sticky and very challenging ) you will have a rye flavoured loaf and you can change proportions next time..
Say 200g starter (I am picturing a mix of flour and water that has been allowed to ferment and has been refreshed regularly..)
150g wholemeal rye
Water.. I would be looking for a very loose dough..impossible to pick up with your hand but enough structure to capture gas, mix the hell out of this! Get lots of air into it ( in a bowl with a whisk or similar or your fingers or maybe a big fork)
Leave to show signs of good strong activity ( some hours possibly.. )
When it is going.. take 300g of it, add say 300g of wheat flour and 50g of rye.
Salt will depend on your own preferences.. I would personally go for around 5g in this, again you can add more or less when you try again. Salt seems to be more noticeable in sourdough.. it doesn't take much to be too much, and too little isn't a huge problem as the loaf will have loads of flavour anyway.
Water.. the starter mix will be a good amount of water but not nearly enough.. add water in 50g splashes (yes I weigh water!) You want a dough that comes together in a ball, looks a little coarse and rough but is wet and tacky on the surface.
Now use your muscles! Whatever mixing technique you use make sure there is lots of pushing dough away from you and folding back on itself.. streching lays the gluten into a better structure, folding back captures air. The dough will intially break but you will notice it becomes more pliable as you work it.. if it remains as a nasty fragile lump then flatten roughly with you hand, indent it with your fingers and splash water into the dents.. then more muscle..
You will be breathing hard if you are working the dough enough.. when it is pliable, stretches without snapping and feels and looks smooth you are done.
Cover it and let it do it's thing. There are lots and lots of books/video/photo instructions of how to shape and so on..
I woukd be leaving the dough for at least an hour then gently pushing it out and folding it back in a much gentler version of the mixing.. you should be feeling the air in the dough now, you worked hard to get it in so handle it gently to avoid forcing it all out again.
Depends again in what shape you want..use a proving basket etc etc.. to create your final shape. Whatever you are doing.. the dought is ready for the oven when you can make a dent with your finger gently pushing into the surface, when you take your finger away the dough fills in the dent slowly.. doesn't spring back but sort of reluctantly fills the dent in..
Then, oven. Hot, humid and for about 35 minutes but there are too many variables to give you a proper time.. go for the colour you want but it will take around 30-40 minutes to bake through.. if the colour is too much then it means a lower temp, possibly for a longer time.. it is one if the most variable stages.
Sorry for the essay.. you ask a baker how to make something, it's never a short answer I am afraid and I have made this as short as I possibly could!