The worming etc is complicated.
You can find advice by searching online .
As a rough guide, from my notes, we used to treat for worms and fluke 3 or 4 times a year, say October, January, April and maybe July. ( you may need to do it more often depending on weather)
If you were looking at the the cost of products you could look up combinex which you'd use in October and January and then you'd use a different product for the April and July, such as Mebadown or supaverm.
You could look these up as a starting point. These are combined wormers and flukers with different ingredients.
Once a year, usually 6 weeks prior to lambing, you give them heptavac. The first year they need 2 injections, then it's annually. The stuff doesn't keep so you are supposed to buy a new pack every time.
In terms of fly strike etc, people don't dip much anymore. You'd get crovect and pour it on. We do ours at shearing and then again in the autumn.
You'll find these products online.
It'll give you an idea of cost. If you get products with a long shelf life they can last a couple of years of dosing.
Sometimes your local vet can give you smaller doses of wormer etc to save you buying a big pack. But some don't.
Sorry it's complicated, and other people may do different things
Hope that helps a bit
Joanne xxxx