Wraiths have life steal and wolves have a high crit rate, but they do not give you a buff if you kill them.
If you are under level 30 then jungling with fiddlesticks can be quite risky. You need armor (Or health, but armor is better) to start or you will die. You should get this armor through runes and masteries, not items (cloth armor is often used for many junglers as it will build into Madreds Razor, but it doesn't help much on fiddle). I generally start with an amplifying tome (which i turn into a lucky pick) and a health pot. I generally start on blue buff. Auto-attack once, start draining. When your drain is finished, hit that health pot, auto-attack until drain is ready and then drain. When that drain is finished hit smite. Once you have blue buff you can just spam drain non stop. Good luck.