Which Turbo Tax package should I buy? I have to submit Form 1040, 1041 and KY State.

You will need two TurboTax products to handle your needs.  While the personal products will handle your 1040 and state personal returns, for an estate/trust  return (1041)  you will need TurboTax Business.  You can visit the following link to purchase the program: TurboTax Business.  

TurboTax Business will take you through an interview to prepare the business return, similar to the personal (1040) products.  As part of preparing the 1041 return, TurboTax will prepare K-1 forms for each beneficiary, which they need to enter into their personal 1040 returns.

To decide which of the TurboTax personal products is best for you please click on this link:  TurboTax Products

"I have to submit Form 1040, 1041 and KY State."

Note that TurboTax Business does not support Kentucky fiduciary (trust-estate) in the event you need to file that return.

See https://ttlc.intuit.com/community/state-taxes/help/which-states-are-not-supported-in-turbotax-business/00/25580

I have to submit Kentucky state tax with my 1040. How would i purchase Kentucky state form?