Hello, I am new too. I inherited both rasberry canes on my plot too. Here's what i have found out. The big long thick ones were the summer flowering ones and you need to wait and see which of those canes give you fruit this summer - and then they are the ones you cut down when you have harvested the fruits. The other canes in that summer fruiting patch will give you the fruits the next year, so leave those ones alone.
The autumn fruiting canes appeared to be smaller and thinner on my plot and they are the ones I was told to cut right back by about now - right to the ground. They give the fruits on the bits they grow this year.
I have also read that you should mulch around the plants with compost or well-rotted manure as this will help to keep moisture in the ground around the plant.
And then there's the question of supporting them. The summer ones seem to grow really tall and mine have posts sunk into the ground either end and then washing line about my knee height (60cm ish - I am small!!) and then about my waist height (metre and a bit) and I think you are supposed to loop the canes into that (it is doubled so I just twist the cane into it). I think once they get above the height of the top of the post you can also bend the tips into the topmost line so they arch over - looks pretty!! The autumn ones don't get that tall so they don't need any supports (I say that now, I may be wrong as I have never seen mine in the autumn, having only got my plot in January!)
Don't know anything about feeding or watering them and I have no idea if they need netting from the birds.
Can't wait to taste mine though, and learn to make jam and stuff with them, as I seem to have rather a lot of them!!
Good luck, keep us posted how you go.
Lara