My experience with plants in general has been that to get a bushy, full look, you will have to do a bit of pruning initially to force side shoots to grow. Once you achieve the number of side branchings you want, you dont have to cut much, if at all, for quite a while unless the "adult size" of the species is too big.
How red do you want the plant? Many species have red tips, or a red tinge. Not a lot of plants are straight-up RED colored throughout.