Absolutely second Cogito Delia's Complete Cookery course is brilliant.
Whenever I make a bolognaise/mince I tend to do double and freeze it in individual portions. I also throw in a couple of extra portions of spaghetti when I'm cooking that. I don't bother with the rinsing/oiling of it though. FOr the next evening's supper, for about 150/200g spaghetti from the previous day) whisk two eggs, seasoning and a generous handful of grated parmesan/cheddar, then add the cold spaghetti (this doesn't work so well with freshly cooked spag/pasta). Melt 1/2 tbls oil with 1/2 tbls butter in a frying pan over a 3/4 heat. Throw in the mix and cook for about 3-4 minutes. Slide it out onto a plate and flip over before cooking the other side for the same sort of time. Cut into pizza wedges - great hot, warm and cold for picnics too. I sometimes throw some ham in or sweetcorn, peas, spring onions etc etc to beef it up.
Yet to meet a child that doesn't enjoy it and it's one of the best ways to use up left over spaghetti.
Try to get into the whole batch cooking frame of mind - one weekend in four making bolognaise/savoury mince, simple pasta sauce which will keep in the fridge for a week in a sealed pot, I do:
2 tins tomatoes
onion onion roughly chopped
couple sticks celery roughly chopped
2 cloves of garlic, chopped
good handful of fresh basil
dried oregano
salt and pepper.
Heat some olive oil in a saucepan, add onions and garlic on a medium heat for about 5 minutes, lob in tomotoes, oregano, half the basil and cook on a low heat for about 20 minutes (I sometimes add a splash of red wine if there's any knocking about too). Add the remainder of the basil and whizz it with a stick blender, check seasoning and that's it. This will easily keep in the fridge for 7-10 days in a kilner jar/tupperware - throw a tablespoon or two per portion of (toddler) pasta, some grated cheese and that's supper sorted for them. You can also turn this into a nice soup by using the base, adding 5 or so chopped fresh tomatoes, 1 pint of chicken or veg stock and some dried red chillies. Any old veg soup is very easy to do and a handy fall back when you either can't be bothered, or don't have time. 2 pints of chicken or veg stock, with, for example - 1/2 medium onion, 1 clove garlic, 1 medium carrot, half head of broccoli, 1/2 head of cauliflower, 1/2 courgette, 1 stick celery and a tomato. Soften onion and garlic then throw the rest in, simmer for 30 minutes, whizz and season. If it's too thick just add some more stock or milk, if it's too thin peel and cook a couple of potatoes in the 'thin' soup, then whizz once again, or buy some tiny pasta strands (like lots of broken up spaghetti) and cook them in there for a few minutes.
As said upthread, I also use the 'if it smells ok, it will be ok' food safety method! When you open packs of ham and cheese, wrap in clingfilm/put in tupperware and they'll be fine for about 5-6 days.
Another great cookery book for relative beginners is the Good Housekeeping one. Very easy to follow instructions, great illustrations and meals for every possible occasion. The baking sections are also very good.
I could go on and on with tips and recipes...if there are any particular things that you want to know how to cook/etc, do PM me and I'll be more than happy to real a load off for you.