I can see you’ve already got some great suggestions and advice from the coven In addition to what has already been shared, we have a pretty big collection of Samhain spellwork, ideas, and activities a witch might enjoy for the holiday.
Here are few additional resources for Samhain suggestions:
As for making an ancestor altar, I absolutely agree that it can done in thrifty ways. Do you have any old photos, or items that remind you of them? Placing these on your altar or in a special place along with a candle is a simple but warm way to welcome them into your space and let them know you are thinking of them
You might find some more ideas and encouragement in the Ancestor Altar Guide: