I am a sahm and to begin with it wasn't by choice, but I accepted the role I was offered and now I love it!
I only had ds1 at the time, he was 16 months. Now he is almost 6 and I have ds2 who is almost 3.
Some days (like a job) are better than others. I find a bit of a routine helps me and ds2. We have the school run to do anyway.
Getting out and about is a good idea, and socialising with other adults. To begin with the only conversations I had (because we moved 100 miles away due to dh's work) were with checkout people
Soon investigated local goings on, made some lovely friends, and do get together with a few other Mums although we refuse to use the words "coffee morning"
Sort out your finances because that was a worry for me, even though it has always been our money I still felt weird not contributing financially. Am way past that now.
And in summer when you are playing in the sandpit making sandcastles, or you are out in the garden and your child has their paints out, or you make lego cars/planes/trucks, do nature walks, eat the ice lollies you made etc you can think of all those people stuck in an office somewhere with no air con. Works for me
I love having a bath in the middle of the day with ds2, making his hair into all different styles with shampoo, ah tis great stuff.