How brilliant being on a road where folk come already to PYO, go to the garden centre etc. Hens take up little time so if you were to increase the numbers of hens you keep you could sell eggs at the gate (there's another thread about ideas for safe money boxes at the gate). When setting the price, look around at the supermarkets, other farm outlets, and take into consideration what you pay out for feed, bedding etc. As you are out in the day, you may need to put up a high electric fence to protect the flock from predators, enclosing quite a large area so you would legitimately have free range hens. Any more than 50 hens though and you are subject to rules and regulations.
You would also be in a good position to set up a roadside stall selling your bakery products (you need approval and to follow regulations), maybe jams and chutneys too.
If you enjoy gardening, you could sell produce, flowers and foliage, again at the gate.
The most important advice is don't rush into anything, especially projects which take a large initial outlay, where if you get it wrong you've wasted a lot of money.
You mention sheep, but as you are pushed for time how about starting with a few lambs destined for the table, buy them in the spring, send them off in the autumn, and you have no bother with lambing, keeping a tup, shearing etc. Once you have learned about keeping sheep from these lambs, then you could move on to breeding a few of your own lambs for your freezer. 4 acres is not very much though so you wouldn't be able to keep a large flock, especially over the winter.
If you have any equipment, or can afford to buy second hand, perhaps you could crop the currently surplus land for small bale hay which you could sell to other horse owners, or smallscale sheep owners. Once you have got your smallholding going, you would still need the equipment to make a small amount of hay for yourselves.
So my advice is to take it slow - too much at one time turns a happy hobby or lifestyle into drudgery.