Re: not calling it shopping - that could seem too uncertain perhaps? Sometimes being very specific can reduce anxiety, so rather than 'shopping' you will go and get some new shoes, then a loaf of bread, and then come home again. A 7 year old can then see more clearly what exactly is going to happen, there are no gaps to fill in, especially as at the moment they have no idea what 'shopping' will normally consist of for you.
Just as 'breakfast' means different things in different families, as does any other generic word. Others have suggested visual timetables, I know for some families where the children have anxiety around food availability they have found putting up weekly menus and timings of meals and snacks useful, and routines are great such as going to the same place (park, swimming pool, library, whatever) at the same time each week, it reduces anxiety and creates a feeling of family - this is your family tradition.
Routines also reduce conflict - DD will argue anything and everything quite happily, but her bedtime routine is so ingrained she just does it without question. Plus, use technology to set your boundary if you can - DD's computer log in switches the computer off at 8pm which is what I have set as her end of screen time and move into bedtime routine. It creates a completely different dynamic than me telling her to switch off the computer because it is 8pm. No scope to plead, negotiate, rant at me (I am usually not even in the room!).
Think of repetition as a way of strengthening your bond and relationship, and defining you as a family unit - what will your Xmas traditions be? Do you do anything in particular to mark the end of the week, the end of the term? What do you do on birthdays (breakfast in bed for the birthday person? When do you give/open presents?). Do you have a special breakfast on Sundays? Is Friday night always pizza/ fish and chips / other particular meal? In the early days I suggest less flexibility rather than more, for everyone's sake, the less you have to think about 'what do we do / cook / clean today?' the less mental energy it takes. As you go along you will work out what is useful or fun for your family, and what you can drop and become more flexible and spontaneous.
Just as DDs now knows that 'taking a book back to the library' in my world means the best part of an hour pottering around looking at books, at the end of which I might or might not take some out
but 'shopping' means as quick a sprint round the supermarket as possible. Clothes shopping is now delegated to them, as DD1 is old enough to handle taking DD2 and they both looove spending hours looking at clothes
these are things we joke about as a family, it makes us US as a family