These ideas would be best in listed form because they require step by step instructions. Making a cake and planting a tomato garden requires step by step instructions which are best written out as a list.
You do not need step by step instruction on what food to bring camping, however, you are making a list of food items like you do with a grocery list.
You don't need paragraph formatting for any of there topics.
Comic books are worthwile to read by everyone because they are another art form. Whether a book has photos, small print, boxes, whatever, they all have a meaning. The stereotype that comics book are just for kids or are only superhero related is outdated and leaves the wonderful world seeming closed off to so many.
If those are the only options, then the coordinating conjunction must be but. Coordinating conjunctions are words that connect two clauses, phrases, or words by treating them equally - one is not dependent upon the other. If those two are clauses, they must be independent clauses that together form a compound sentence. Besides "but", coordinating conjunctions are "and" and "or".