As mentioned on another thread, modern recommendations are that worming without knowing worm burden can increase wormer resistance and wormers will stop working sooner than later. A poo sample can be analysed by your vet, several samples will estimate overall worm burden in your sheep and see if wormer is needed. Two worms don't fit this pattern, where fluke eggs don't show, except on a more specialised test, and young fluke that are not yet producing eggs can cause disease. Nematodirus also can cause problems in late spring / early summer in lambs before they start producing eggs. Usually the vets will be able to advise when and if you would need to treat for those, if you are in regular contact for them to check your sheep poo samples.
In terms of vaccination, it is highly recommended to vaccinate against clostridial diseases, which include tetanus and mostly cause serious illness or sudden deaths that don't respond well to treatment. Heptavac P also covers Pasteurella type pneumonia which can also kill very quickly. Your vet can let you know what is likely to be a problem in your area and supply vaccine. Usually starting dose is two injections, 4 weeks apart. If the sheep will be lambing, having the second dose, or the annual booster 4-6 weeks before lambing gives the lambs some protection.
Hope that helps, enjoy your sheep, and feel free to ask as many questions as you need!
Suzanne