“First, I steamed and mashed kitaakari, then mixed in yogurt, sliced red onion, diced apple, and salt to make a delicious potato salad.”

I'm satisfied with my lunch.

秋だから　紅葉が楽しめてのんびりできるといいな

11月の休日を予定

お出かけの候補地

ラ・コリーナ　(滋賀県近江八幡市）

宇治平等院　　（京都府宇治市）
伊賀上野城　  （三重県上野市）

I will start my blog in English.

That’s exciting! What’s your blog going to be about?

I have three topics.

Ooh, three topics — nice. What are they?

I don't have much experience yet.

“Please correct me if I make a mistake”

Ah, I think you're asking 

"Is that correct, the sentence I made?" — you could just say "Is that right?" or "Is it correct?" 

Both work nicely and sound natural.