General Hydro is great for noobs. Their 3-part is easy. You can also try 2-part (Lucas Formula) which is very simple.
Other brands include, Sensi, Advanced Nutrients, Fox Farm, Remo Nutrients.
Imo. all brands are more or less the same. (Marketing!) Do some research on each and see how others are using them online. See what is available around you. Pick something that you find is priced reasonably.
You really only need a good three part. Don't be "Sold" on buying a whole bunch of other stuff you don't "really" need. Once you dial in your basics, then you can play with additives and other fun nutrients if you so choose!
Happy smoking!
Ps. Organics are harder to work with than synthetics, but it does depend on your medium as well. (ie. a correctly ammended-organic-soil-mix would probably be super easy to use. But organics in hydro are trickier.)