Use sneak, and hunt when your solo'ing or pulling with a stealthed skill... Stalk should only be used when your in a group, fighting a mob, and you want a quick switch into stealth. Later on you'll get shrouded strike, which will usually replace Stalk (as its a high damage hit that puts you into stealth).
However you'll want to keep stealth around due to it lowering agro on you, so if you ever over nuke it helps in getting agro back on your tank, and off of you.