How To Buy Art At A Gallery Without Feeling Lost
The conventions are unwritten, consistent, and easier once someone states them.

Commercial galleries are free to enter and can feel closed to anyone who has not been before. The conventions are real but they are not designed to exclude — they are simply never explained.
Prices exist and asking is normal
Most galleries do not display prices on the wall. There is a price list at the desk, and asking for it is ordinary behavior that gallery staff expect many times a day.
Ask for the list, and ask about anything you are curious about. Interest is not a commitment.
What you are told about a work
For a work you are considering, reasonable questions include the medium and dimensions, whether it is unique or part of an edition and of what size, the year, the artist's exhibition history, and whether works are held in public collections.
For an edition, establish which number and whether artist's proofs exist beyond the stated edition.
Condition and framing
Ask about condition, whether the work has been restored, and what framing is included. Framing on paper works should be archival, and it is worth confirming rather than assuming.
Discounts
Modest discounts are a normal part of the market, particularly for collectors with a relationship to the gallery. Asking politely whether there is any flexibility is unremarkable.
What you should receive
An invoice describing the work fully — artist, title, year, medium, dimensions, edition — and a certificate of authenticity where the artist issues one. Keep both permanently; they are the provenance record.
Payment plans
Galleries frequently allow payment over several months for works above a certain level. It is not advertised and it is commonly available.
The honest advice
Visit repeatedly without buying anything. Galleries change exhibitions regularly, admission is free, and the only way to develop a view about what you like is to see a great deal of work. Nobody will mind, and the ones who do are not worth buying from.