of course we use “home altar” as shorthand for a prayer corner or shrine, since of course the sacrifice is not offered here. do spend time on the old thread above some are just lovely.
my only advice: include only what directly inspires and aids you in prayer, and that less is more. Don’t overburden your space with pictures, statues, candles etc. because the will become a distraction rather than an aid to prayer. This space should above all be a retreat, and everything in it planned to set it apart from the rest of the house in mood and feel. So don’t bring your crossword puzzle book or electronic game. You can have a CD player, unless music distracts you in prayer, but do remember there are times for silence, music is not always appropriate. Don’t have 100 CDs there, just a small selection, fewer than 10 say, that are most conducive to prayer for you (that is very personal).
Same with images, only what works for you at this time. Aside from a crucifix, possible some image or statue of Mary, I strongly advise only one other icon or statue at a time. You may have others, but only one at a time in the most prominence, that which at this point in time is most affecting for you. Even the best ones can get “old”.
Just as in lectio divina you stay with one scripture passage only as long as it speaks directly to you, then move on to prayer and contemplation. The next time you choose another passage. The same with the images and icons.
Look for what you can leave out, not what you can add.
also with incense, candles etc. observe fire safety rules (duh) and if you are allergic or have asthma, they can be the worst offenders so choose wisely.
same with books, less is more. Other than your bible, missal or LOTH or other prayerbook you like, perhaps daily devotional or magazine based on daily Mass readings or the like, have only one spiritual book, the one you are into at this time. Ideally that should be one suggested by your spiritual director or someone else who has a positive influence on you, and you stay with it, as long as it takes, until you finish, before starting a new book. Shelves full of books I am going to get to someday are a distraction.