Roses are pretty selfish and like their own space. They will grow to fill a space but give them room to get established.
They like good drainage and need feeding properly a few times a year, usually when the new growth starts.
Bare root roses do very well as they are dormant and don't mind being moved at this stage.
Prepare a good bed. Dig deep and add in lots of organic material, preferably well rotted horse manure. Needs full sun usually for roses to thrive in uk.
I'd put in decent supports at this stage.
Plant carefully following David Austin's guide to planting.
Worth bearing in mind that Ramblers are prolific and climb and ramble.
Climbers are roses that put out side shoots that need training along supports, not up as I discovered.
And shrub/bush roses are fairly good with minimal support and form a nice rose bush.
Water in well until roots establish.
All my David Austin are thriving (alongside an unexpectedly beautiful pound shop rose). I get three flowering times a year with the extra feeding. Beautiful fragrance.