My Ds is 8 months and has things like:
Breakfast: Toast with dairylea or a little scraping of jam, porridge with some mashed up banana or some stewed fruit. Yoghurt - he loves the petite filous - they are usually on offer in Asda - 18 for £2?
Lunch: Scrambled egg, egg bread, boil in the bag fish in parsley sauce with some little chunks of bread added, philidephia sandwiches, little bit of pasta with tomato sauce, cheese on toast. Usually has a yoghurt afterwards. He also likes banana, just peel it and hold it for him, he bites chunks off.
Tea: Mash potato with peas and a little bit of gravy, vegetable soup (homemade - just whatever vegetables and some stock), beef casserol (again some stewing steak which is uaually quite cheap - asda had 2 boxes for £6 last week, was enoough to make 2 big pots, vegetables, stock and little red wine if you want - if you make loads can freeze and defrost as and when - cook for about 4 hours on 160 deg), mash with cheese and a few beans, macaroni cheese, spag bol, tuna and mash or tuna and pasta,
Also, there is no shame in giving your lo a few or 2 of baby food if you are pushed for time or ideas - asda do the HIPP ones which are organic 6 jars for £3.50 which would last a couple of weeks if you had one every other day?
Perhaps you could ask on the wanted boards if anyone had any baby cook books that they were finished with that you could have? Or ask at your local library. It might give you a few ideas that you could alter to suit your budget/family needs/skills?
Hope your mum is ok.
I feel really sorry that you have been jumped on by so many people when all you were asking for was a little advice. I think at 16 you are coping amazingly well - I certainly couldnt have run a house and looked after a baby and pets at that age!