for the 9 years I have been brewing, I never got a bad infection from lack of sanitation. Sanitation is important, but 30 min in bleach/water is a long time for your equip.
I used onestep for most everything and iodophor for everything else. Iodophor is an awesome sanitizer, 3-5 min contact, drip it dry and its ready to go...
Temps are important also, you will find some yeast form different "flavors" at less than ideal temps (hi or low). I suggest you start with an extract kit, and move from there. a good homebrew shop/club would be a great asset too. Also stick to a good, hardy dry yeast until you know what your doing. They are more stable than the liquid cultures, and will be more forgiving to temp swings...Try Nottingham for most of your ales in the beginning. Very forgiving yeast. Not too many flavors in low temps, and it will stay fairly active if your fermenter drops into the 60's...
Definetly consider going with corny kegs asap... you will never look back.
GL with the MR. Beer, I started with it, got a half decent batch out of it, and then I was hooked!
I tried to make my own rasberry wheat in the Mr. Beer too... that blew up all over the closet... dont try that...what a mess.
FYI- if you havent bought more MR Beer kits, dont. go find a shop and talk to them about extracts. You can grab a glass carboy for 20$ and an airlock and your in the house (providing you have a brew pot already) Also, go for the turkey fryer to boil with, a home stove will take forever.
Its funny, I just opened a 5 year old Choc Stout I made, because a friend wanted to try it. It was SOOOO much better than when I made it... it almost wanted to make me brew another....but I cant drink beer anymore...(health issue) so it was just a tease....

GL if you have any Q's hit me up.