I can't tell you much about peppers because you're in such a different climate from mine, but roses are easy! They like nice rich soil with plenty of well-rotted mature or similar, and at least some sun, and enough water that the soil never dries out completely. (The compost/manure will help it hold water.)
Things that will actually kill them: complete lack of water, or soil that stays waterlogged for weeks on end. Oh, and try not to plant them where roses have grown before. Pick a fresh spot instead, or they tend to struggle from replant disease. There are other problems they often have -- aphids, blackspot etc -- but as long as they have good soil, sun and water, they should be tough enough to survive without intervention. Here in the UK they do best if pruned hard in late winter, but you maybe don't need to do that in such a warm climate, I'm not sure. But you should deadhead repeat-flowering roses (cut off the spent flowers) to encourage them to produce new flower buds. Most shrub roses are repeat flowerers.
(Climbing roses are slightly more complicated as you do need to prune and tie those in to get them to climb the way you want.)
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Things that will actually kill them: complete lack of water, or soil that stays waterlogged for weeks on end. Oh, and try not to plant them where roses have grown before. Pick a fresh spot instead, or they tend to struggle from replant disease. There are other problems they often have -- aphids, blackspot etc -- but as long as they have good soil, sun and water, they should be tough enough to survive without intervention. Here in the UK they do best if pruned hard in late winter, but you maybe don't need to do that in such a warm climate, I'm not sure. But you should deadhead repeat-flowering roses (cut off the spent flowers) to encourage them to produce new flower buds. Most shrub roses are repeat flowerers.
(Climbing roses are slightly more complicated as you do need to prune and tie those in to get them to climb the way you want.)
Have fun choosing your roses!