Novice Wine Tasting Party

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Hi, everyone! I am new here and I was hoping you could help me. My husband and I are hosting a small, family wine tasting this weekend. People are asking us what they should bring. The family does this from time-to-time, and now it's our turn, but we know so little! We'll be tasting reds. Could you please suggest 6 or 7 good, relatively inexpensive red wines? We are looking for a range of tastes. Also, is it necessary to decant all of the reds before tasting? Is there some "tasting protocol" for reds? Do you have any other tips for a tasting? Any and all advice is appreciated. Thank you so much!