Watch your rose grow. See what it wants to do. We recommend planting climbers and ramblers 6 to 8 feet apart. If you really want to grow a lot of them you can plant at 4 feet but you will have to deal with their vigor. Planting at wider spacing and training the canes horizontally will encourage more blooms from the lateral growth.
Roses love water.
Provide 1 to 2 inches of water a week per plant. A tuna fish can makes a great, economical water gage. Ground level watering is best but overhead watering is fine if you water in the mornings so that the plants do not go into the night with wet leaves. I have a lot of shade in my garden. Some roses may grow reasonably well in partial but not dense shade.