preparing a bed for raspberrys

Hello there every one  coley barn kid here    based in south lakeland   held an allotment for 3 years now     looking for advice on how best to prepare the ground for planting raspberry canes    i e   lots of well rotted muck / or not  ?      sea weed extract ?   potash ?  fish blood bone ?   area is well drained   past crops on intended area  brassicas  will be planting 20 / 30 canes  50/50 early / late varieties   did hope to keep low maintainance by planting through a weed suppressant membrain with wood chip mulch over   

Raspberries are shallow rooting, about 12'' deep max apparently.
They prefer a slightly acidic soil with a ph about 5 but Im told they do fine in soils with higher ph. They like well drained soil. They don't mind a bit of well rotted manure, so you could drop a few ton in when planting  .
But because of the shallow rooting, once planted it may not be wise to dig in any compost/manure for fear of damaging the roots. Mulch with compost/manure in spring and let it work in natrually.

The biggest problem is containing the roots. They can shoot up everywhere by sending out runners. I think a good pruning programme is key.
Some people contain their canes by burying slabs to form a kind of "Box", others keep them in pots buried in the ground.
I'm planning to put in Raspberries soon but I'm gonna do a bit more research into their spreading habits and any containment needed before I go steaming in and creating yet another pest.

thanks all    some good pointers in there

My top tip would be to make sure you carefully remove all weed roots before planting and then add a mulch layer after planting to minimise any weed growth as they can be a pain to remove once established amongst the canes.