You only seem to want to give up work because your mother did. You are a self confessed career girl and I think you will utterly miserable wiping arses and doing menial chores - and this is about 80% of SAHmotherhood for the first 5 years.
My typical day with my 1 and 4 year old was like this.
Rise with 1 year old 5.30 am
Give bottle and breakfast
Wash and dress 1 year old
Put load of washing on
7.30 am 4 year old rises
Give breakfast and drink
Wash and dress four year old
8.30 eat own breakfast whilst supervising children closely (you cannot leave children this age in the same room alone)
Play with children. Answer interminal nonsensical questions
10 am put 1 year old down for a nap, go upstairs leaving 4 year old drawing/playing on computer or simply following you around, to wash, dress and finally get a bra on.
10.45 wash up breakfast pots, wipe kitchen table down, and sweep under the table as cereal is all over the floor. Pick up all the lego.
11.15 put coat and shoes on both boys, to walk four year old to preschool.
11.45 arrive at preschool, drop off four year old, take 1 year old into town as it is not worth the half hour walk home to pick up in 3 hours. Go to Morrisons, buy something for dinner, take 1 year old to a cafe for lunch, walk to doctors to drop in repeat prescription. Walk back to preschool to cllect 4 year old.
3.30pm arrive home. Put 1 year old for very quick nap, and deal with tantrum about chocolate from overtired four year old. Continue to answer interminal nonsensical questions, this time delivered in a fetching monopitched whine. Prepare vegetables and potatoes for children's tea, and some vegetables for your own dinner later (I don't like to eat at 4.45!), and be moaned at by tired 4 year \old.
3.50 - veg is prepared, 1 year old is awake, hungry, and not happy. he cries continually. You balance him on your hip to continue with dinner, whilst answering questions about why baby is allowed to be in the kitchen when the four year old isn'ty, and how it's not fair, and informed that you are probably the owrst mummy in the world and, in fact, the four year old hates you.
4.45 - serve chicken, vegetables and mashed potatoes. The four year old hates this, it is boring. He is hungry, and wants cereal, or cheese. The 1 year old eats it ravenously, which just about stems your frustrated tears, but he is very independent and does drop a huge amount on the floor as he refuses to be spoon fed. You dish out yoghurt to the 1 year old, triggering absolute hysterics from four year old who hasn't even tasted dinner, and now hates you. Again.
5.45 - you take both children straight upstairs for a bath, wash them, dry them and pyjama them. 1 year old does massive poo. YOu rechange his nappy, and his pyjamas (the nappy leaked)
6 30 - you are all downstairs, (you are exhausted and need tea and dinner).If you have a partner, this will be the point at which he will waltz in and ask what is for dinner. Try not to throw anything at him, legally this is domestic abuse. If you don't have a partner or he isn't around for any reason, you then have the fun of "two child bedtime"
The best way I found was this
6.45 pm - 1 year old into cot with warm bottle of milk and a story. Stroke head, remove bottle, and go downstairs
7pm - play simple game with 4 year old who feels neglected throughout bedtime for the 1 year old.
7.15 pm. - put four year old to bed (they share a room, so if you aren't lucky the 1 year old will still be awake, the four year old will climb into his cot and they won't drop until 9)
7.30 pm - four year old is down again, complaining of hunger. you provide quick drink of milk and pack off to bed.
Load washing machine (yes, again). Clear table, sweep floor again. Start own dinner.
8.30 pm sit down to own dinner. Four year old wishes to inform you that he has found a button in his bed, and that you are to guess what colour it is.
You pack four year old off to bed. This action wakes 1 year old, who screams. You go to settle one year old, he isn't happy, and this takes a while.
9.15 Both children asleep. Your dinner is cold and ruined. You grab 3 rounds of bread and butter and eat them with crisps, topping up with a bowl of Honey Waffles with full fat milk, as by now you are hungry, exhausted and miserable.
10pm - winch yourself off the sofa, and go to bed.
2 am - 1 year old wakes up, demanding a drink.Provide drink
If you are used to a pleasant predictable day, being a SAHM is hell on earth. Think very carefully before you do it, because if any of the children you do have happens to have special needs, the above will be your life pretty much forever.