i felt the SAME way when i got Layla.. what have i done!!!! i was so worried i was doing everything wrong... but
1) PUPPIES SLEEP
a lot!! so dont' worry if you think she is sleepign too much... they sleep and play... so as long as she plays hard and sleeps hard... she's doing great
2) puppies have days where they will eat a lot and days where they will not be so hungry.. just make sure she is not lethargic... and you are doing ok! check her gums..they should be pink.. not white... if they are white...try giving her a bit of honey or osmething to up her blood sugar...
if you are crating her a night.. she WILL cry for a few nights... that's normal... give her the option to go out and pee... if when you put her back in she cries... let her cry it out... she will learn to love her crate (I have to DRAG Layla out of it in the morning)
it is COMPLETELY normal to worry.. we've all be there.. but now you are HERE and there are SO many people on here that can help with EVERYTHING
welcome!