With clones its sure that you will have all female plants, they are faster to grow since you dont have to germinate no seed or wait for a seedling to sprout. Both starting from seed and from clones have their own benefits. If you have seeds, you can breed and cross strains, but if you want to have "sinsemilla" (or seedless buds) you will have to watch out for male plants and remove them from females before they release their pollen. If you have clones there is no worries about that. But some say that starting from seed is the best for potency, and some say that the clones genes will diminish in potency and health as time goes by. another thing you have to worry about with seeds is hoping that all will germinate, and all will be female. There are some "bad" seeds that are not healthy and will not make it through. With clones the only thing to hope for is that the mother from where the clones came is a healthy, disease and pest free plant. I would do both seed and clones, have a few clones and a few seedlings, grow them both the same, same soil, nutes, lights, and in the end you will be able to see what works best for you, and what you like best. Oh and seeds tend to be a lot more expensive than clones, and in some areas a lot harder to get a hold of good seeds. And if its your first time growing, consider growing in good old soil or a soilless medium like coco and peat moss as they are more forgiving than hydro, and if you over or under nute it will not affect the plants as bad as in a hydro set up. I know a guy whos plants fried just because his ph was too high in a hydro setup. Whatever you decide to go with, good luck and happy farming!