If I am having a minyan on my porch just on Shabbos, may I bring a Sefer Torah before shabbos from Shul for Kriah?
Yes, if you designate a special place for the Sefer Torah first.
Ideally, you should ensure to lain three times.
If yes, what do I need to know about having a Sefer Torah in my home overnight?
Be careful with its kedusha. Don’t change pampers in that room.