Of course you share few details, Anon, so I'll shoot from the hip:
Work with the spirits of correspondences. Try just talking to them. If the correspondence is feeling a bit inert, this is a good opportunity to practice spirit invocation.
You can "interview" correspondences to learn more about them, how they can assist in spellwork, and so on.
You don't need to have a spell in mind. Try finding five or so household staples (including things like bar soap, vinegar, herbs and spices, cooking ingredients like milk, rice, and eggs, etc.) and evoking a spiritual presence within them to talk to.
Evoking a spirit back into its earthly corpse is a skill in and of itself and can be readily practiced with common household ingredients.
Spirit work can also be practiced out in public, which IMO is a riskier operation; ensure to bring some amount of protection with you.
Try "tuning in" to the spirits of places, or into the spiritual plane where spirits may be roaming. Try to identify if there are any spirits in the places you go. But, keep in mind, that it often seems to happen that when you go poking about, spirits will respond. They may ask for favors, or be flustered at your attentions.
Respond as you desire to gain experience in spirit work.
General offerings, given outside if possible, are an excellent avenue to practice spirit work. An offering given to broad categories of spirits (such as the spirits of the home, the land, the ancestors, the helpers, to those who don't stand in your way, and to those owed reparation), has the tendency to draw in lots of spirits.
This can help provide experience in watching spirits coming and going; in knowing when one is trying to get your attention; and in carving out time to pay attention to the local spirits, to help resolve issues.
If you have a few enchantments already worked up, like an ongoing container spell or protective amulet, engage the spirits of those objects. You can also work directly with the spirits of just about any tool of witchcraft: prepared waters, oils, powders; wands and ritual knives; any object kept on the altar, and so on.
Divinatory tools tend to be especially talkative.
This isn't to say that all of your tools, or everything on an altar, has a spirit. Many do not, or only have a vague notion of energies, or energy without sapience.
This is all the better for spirit work practice, to gain experience determining something merely energized from something that can answer back.
If you have the experience and confidence, providing spirit readings for others can rapidly provide a lot of spirit-working experience, specifically in the realm of contact and communication. Get the terms of the reading in writing, approach each reading with spiritual protection and with your own guides, and always behave with dignity.
Astral travel is another fine way to gain spirit working experience, and especially useful if you also need to brush up on your traveling skills. A personal astral temple which you invite the spirits of your court into is danged handy for establishing a point of communication.
If astral travel isn't your thing, building physical vessels for your spirits is a very helpful way to ground them into your life, and also provides experience in and of itself. (*You can do this along with an astral temple, it isn't one or the other)
An accessible form of the spirit vessel is a container, such as a box, which you decorate in such a way that it resonates with the spirit's nature (including only decorating the inside, if subtlety benefits you), and is then filled with objects that similarly resonate with the spirit's nature, or the spirit would personally enjoy. Such a vessel may be very small; advice for building altars and shrines applies here.
Obtaining such a vessel for each important spirit in your life (including gods) can open up doorways that advance the available avenues of spirit work. But it can also just be very useful, in general, as a point of connection. Learning to "read" these vessels, the way one reads an aura, is also very useful practice.
Concurrent with all of these activities is learning how to "tune out" and set up boundaries and barriers to limit spirits from bothering you all the time; so things like establishing house rules, creation of wards specifically to manage spirits, and spirit banishing techniques, also run parallel to spirit work, and will improve your capacity therein.
Last, keep in mind that acknowledging and honoring a spirit is not the same thing as establishing a working relationship with them. So don't feel like meeting any random spirit once or twice means you owe them a shrine and offerings forever.
