Personal vehicle used for business purposes

Hi,

Fairly new to completely running books for a business, do have some knowledge but possibly more questions than exact knowledge hence this post.  Can someone set me on the right path please?

My other half purchased a vehicle in full just before starting his new business using funds from his personal account.  

1. Should I enter the vehicle as an asset with the payment coming from the owner’s contributions liability account that I have set up? 
2. Fuel costs… coming out of personal account currently and entered into MYOB under owner’s contributions. Is this the best and/or correct way?  Is it better to claim by the km at tax time?
3. If I use the spend money option

Thanks everyone!