If someone said to me, "I'm a beginner witch and I want to cover my bases in case I run into magical trouble," I would recommend:
One home ward for general protection, probably as a container spell or as an artificial spirit (perhaps using clove, red pepper, cinnamon, and soil or dust from the corners of the home/property), for the purpose of keeping out ill-fortune, ill-intent, and unwanted guests
One completely separate home ward, probably as a container spell (perhaps using dill, rosemary, and garlic), for the purpose of keeping out uninvited spirits, unwanted spirits, and malefica sent intentionally or unintentionally by other practitioners
One heavy-duty protective amulet, probably made of rusty nails or a piece of hematite or otherwise iron, for the purpose of behaving as a suit of heavy armor in case of spiritual alarm; to be carried about as you solve the problem; the effects of which may be encumbering and too imposing for everyday use
One more mild protective amulet (perhaps made of amethyst jewelry, or an acorn, or an oak twig cross), for the purpose of providing an immediate protection against ill spirits and energies; to be worn when a shield is desired, but a shielding energy-working technique is too draining or time-consuming; should be comfortable to wear as often as desired
Of all of these things, avoid repeating ingredients across charms, unless you are in special allyship with a certain spirit.
Those persons also suffering from nightmares or disturbed dreams may also benefit from:
One bedroom ward, probably a container spell or Witch's Ladder (perhaps containing star anise, amethyst, knotted cord, spiders or the forms of spiders, and rosemary), for the purpose of tangling up ill spirits and ill energies which inspire bad dreams.
Of any ward and amulet, feed it a minimum of once a season; if they're working often to provide assistance, or if the effects run out, increase feeding to once a month; in times of distress, feed weekly or as needed.