Organisation is key.
Lay out EVERYONE'S clothes the night before.
Pack DS's bag for nursery with changes of clothes (if needed) the night before. Have bottles cleaned and put the boiling water into them - all ready to pop into the bag in a hurry in the morning (or before bed if cool enough).
Have YOUR bag ready - handbag, laptop bag or whatever you use. Things like phone charged, money and tickets ready, anything you need the next day (lists of jobs or shopping, anything to drop at menders/dry cleaners etc, any snacks or lunch you bring) all organized.
Before bed, lay out breakfast. So the crockery and cutlery, any dry packets (cereal, coffee jar, teabags or whatever) are all on the worktop/table, the kettle is filled for tea/coffee, etc.
Also before bed, have the following day's dinner organized. Plan what you will eat. Prepare anything ahead of time that you can - take things out of the freezer to defrost, peel potatoes/vegetables and soak in water, make sauces (spag bol, curry etc) so they only need reheating. Basically, you are trying to walk in the door and only have to turn on pots or the oven, rather than starting right at the beginning. If you like stir-fry type dinners, have the veggies and meat peeled and chopped ready to just toss together.
On Sundays, I try to make Monday's dinner (spag bol, curry, lasagna, shepherd's pie, chilli, fish pie etc all work well) - something that is either a sauce that just needs reheating while you cook rice/pasta, or else a dish that goes in the oven and needs no attention. I try to make a double batch, so there is a second dinner that I freeze, and use that later in the week a following week.
Laundry - we have a system where we concentrate on getting clothes clean. So almost every day, we have a load to wash and throw on the airer to get dry (or put through the tumble dryer) - being FT working means we don't often get to put it on the line outdoors in reality. When these are dry, they go into a large laundry hamper in the kitchen which is full of CLEAN clothes. We sit in front of a movie or something at some stage over the weekend, or some late evening that I have the energy, and fold everything and then put it in the hotpress, and wardrobes; DH does the ironing on a Sunday evening while I cook dinner for Sunday and Monday. It means that while things may not always be neatly folded, there should always be CLEAN clothes if we need them in a hurry.
We also, as DH and I both work FT, have got into the habit of making sure we have a plentiful wardrobe. Both the basics (underwear, pjs, babygros etc) and outerwear layers (work clothes that are interchangeable, washable dresses, DH has about 15shirts not just 5) - for the weeks when nothing is going right, we have no time and DD had thrown up on everyone yet again! And also lots of easily washable, cheap but plentiful, clothes for DD when she was small (now, aged 11, she lives in tracksuits and hoodies as there's no school uniform so the only issue is finding tops that she'll accept under those).
Online supermarket shopping is very useful. Or else have a list when you go out. I build my list by keeping a pad on the fridge door and if ANYONE finishes anything off, they must write it up so I know it needs replacing. And I tend to meal plan but always have a few easy options in the fridge (bacon lardons, eggs, cheese, potatoes, fresh pasta and onions are all remarkably versatile in a hurry).
Check the post every day, but anything that you need to organize, pay, look at again - find a place to put things to look at again once a week and sort whatever needs sorting at that stage (Saturday mornings after reading the papers with a coffee? Wednesday evenings if its a quieter day? Thursday mornings your commute is quieter? Find a time that suits YOU).
And make sure you remember to have time for yourself somewhere - yes you will want to spend lots of time with DS and DH but get a walk yourself one evening when DS is in bed or find a nice class you would enjoy, take time for your lunches, catch up once a week with a friend over lunch, arrange a monthly coffee on a Saturday with a friend - find a time and activity that suits you but DO keep some time to be yourself and not just a DW and a DM.
And sleep - remember to go to bed at a reasonable time. Don't worry too much about the house - keep the kitchen and bathroom clean as you go, laundry under control, and work with DH for an hour at the weekend (or get a cleaner in for 2 hours) to get the cleaning done. Sing to DS while you are doing it and make parts of it a game with him. Get him involved once he's old enough - small brush while you sweep, taking covers off pillows, carrying a towel while you carry the rest of the laundry load, carrying his plate to the kitchen for washup, getting all sudsy doing the washing up!!, and so on.
It's very hard work - but doable. I started a Masters degree when DD was 9 months old, (as part of my work) and we live away from our parents but have always managed and are still managing ok now.