Don’t want to seem rude brothers but you are offering bad advice to the OP.
It’s going to be extremely difficult to finish a 10 km run with incorrect shoe type. It’s very important to take a shoe that is slightly bigger than your foot to allow for friction between the shoe and the foot (the foot moves to and fro when you are running). Expect to deal with blisters, shin splints etc. If you are not prepared to choose the CORRECT shoe for your foot type.
My advice is to approach a professional sports shop so that they can determine your Pronation and Supination and choose the right shoes to support your foot type. Pronation and supination describe how your foot rotates when you run. Not every running shoe out there is meant for your foot type….choose the wrong shoe at your own peril
NB: I recently started running for weight loss so I’m technically a newbie in running