For someone just starting a darkroom I always advise using liquid chemistry to begin with. Easy to use, just dilute, no excessive storage required after mixing a stock solution from a powder. Ilford is probably the best to start out with for film and paper developer and rapid fix. Stop bath you can use Kodak.
As someone else pointed out Rodinal is an excellent developer to begin with, concentrated, lasts for ever and about a million posts about using it on the web.