Deeanne is spot on with her advice on sanitation and exercise. I just wanted to add that if you are worried about looking after your children should they get a virus, it would be worth buying an antiseptic mask at the chemist - just for when you are in their room, dosing with meds, etc. I also found it helpful to have a meditation CD beside the bed with earphones - some of the pre & post chemo meds can play havoc with your normal sleep (some of our pink sisters used to clean the house at all hours!) A good meditation CD can lull you into a coma in 10 minutes.
All the best. I hope that chemo is smooth for you, and the sooner you start, the sooner you finish. Michelle xx