How to get started on a book: tips, please?

So many writers here. Good writers. I’ve heard from many that they have started on a book or are thinking of writing one.

I’d like to put my poetry and prose together. Not necessarily to publish it, just to have it – maybe as a gift for family and friends, and for the grandkids one day – you know.

I do not know how to begin.

I have to add – I am lazy. If you (anyone) were to ask me to do it for them (she/he or whatever the non-specific gender fucking thing is nowadays) I would in a New York minute. But I find it hard to do stuff for me. Like buying clothes: I’m great at buying for others, hate buying for myself.

I’ve strayed again.

How would you go about “putting together” and publishing a book of poetry prose and short stories, with illustrations, a la WILLIAM BLAKE (not that I am comparing myself, heaven forbid).

(I should add, I have a friend who has offered to include her designs together with my poetry. Could be about 100–120 pages all in all).

Thanks jells.