I think Etsy is a great resource If you look at “baby witch” kits and the description, you can cobble together your own set pretty quickly, probably with a lot of things you already have! Multi-purpose ingredients include white candles, salt, rosemary and clear quartz – those can be used to substitute for an item you don’t have, often.
You can do a lot with just that! You can cast a circle with your finger, as well, until you make or get a wand (or if you choose to just use your hand in your practice)
good basics for starters would be candles: black, white, red, blue, green, yellow, pink; crystal: quartz, rose quartz, amethyst, black tourmaline, selenite, tiger eye, citrine, sodalite or other blue stone (about dollar each for tumbled stones); ingredients: salt, pepper, garlic, cinnamon, bay leaf, basil, cloves, ginger. Incense sticks or cones, e.g. sandalwood, jasmine, frankincense or white sage/mugwort for smudging.
If you go in a metaphysical store, some less common herbs you might want 2 oz of are mugwort, hawthorn and angelica - there are hundreds - but these are used in spells
some items if you find them or have them: keys, mirror, shell, feather, bowl - a box to put everything in!
Some of the Spells8 spells use ingredients like cinnamon, bay leaves, cloves, garlic, honey, lemons, etc.
Protection and defense spells - you might use a black candle, black tourmaline or obsidian, black pepper and salt. a hand mirror for some spells. Lots of common herbs and spices have protective qualities and some are associated with warding or banishing, as well.
Love spells (including self-love, friendship, etc.) - pink candles, rose petals, hibiscus/sorrel tea, honey and rose quartz…
Money and luck spells - green candles, green aventurine, pyrite, basil, cinnamon, etc.
Divination - any color but yellow or purple candles would be good, a black bowl for scrying. You could buy or make a pendulum and pendulum board. You can print Tarot cards from the spells 8 site.
And then there are the things you can find outside, like acorns (luck, protection) and pine needles (new starts, good luck) or leftovers like egg shells (to grind up and make protective black salt), dried orange rind (happiness, prosperity), bones (Samhain, connection with departed.) or strawberry leaves (good luck).
You might save small jars with lids. Jar spells are fun and easy to make and you get a good idea of correspondences with jar spells. I know there are some great jar spells on this website and a wealth of them on Pinterest.