shubh ur post reminded me of my first time.it was a magical time having my first baby and now with the grace of God i have 3 kids.one girl and 2 boys.the youngest is 7 months old and the eldest,daughter is just about 4.they r all angels.
about the diet plan,well it may sound "common" to u like u mentioned about the diet plans 4 expecting mothers that they sound common,but with experience and vast reasearch i will suggest she should pretty much eat anything she feels like,except for some foods offcourse that r not advisable during pregnancy or breast feeding.she should include pretty much everything in her daily diet ranging from meats,sea food,veggies,lentils,beans,greens,even sugar intake is important.she should take fresh juices,lots of milk and other dairy products.for vitamins,fresh veggies r really good,then she needs her iron,protiens etc.if its her first trimester,she must be having a hard time coping with nausea and repulsion from certain foods.so the best trick is to go for what she feels like eating,which will change everyday.she would love one food one day and may hate it the next day,so it gets tricky for husbands sometimes.
so best of luck to u and ur wife and lots of good wishes.