I recommend
www.cheapskatemonthly.com
There is info on spending plans, debt reduction, savings(2 different ones each for separate things). I love the site
I can't tell you what your grocery goal should be, it depends on your costs, if you eat organic, meats, etc.I'd say save you receipts the first month then llok at them and see where you do better. We're a family of 6, I have $400 months and $150 months and sometomes less, but don't shop week to week anymore, I work with a pantry... The higher months tend to be summers with camping and stocking seasonal fruits in the freezer. And around Christmas when we have house guests.
I'd say to try and save 10% to tuck into savings. If you can't do that much, even 1% works. It builds a cushion over time. So when $hit happens there's ay least a little something for groceries, and if you do it long enough the goal is 3 months living expenses(yeah right..lol). Also things that you need only pay once or twice a year, should have a savings account for. Christmas, birthdays, school fees, kids sports, insurance, car repair budget etc. Take each one and divideinto monthly or per pay checks(bi weekly is 54) and tuck into the account, it'll grow slowly, but when these things come up it won't dip into your household budget, kwim?
Just a few ideas.