How to reach Mangalore Central from Mangalore Junction Railway Station?

I am travelling to my native near Kothamangalam in Kerala. I stay in Bengaluru. Typically, I take a train till Aluva from Bengaluru which goes via Tamil Nadu, but I didn't find tickets due to heavy rush. I also have extra time, so I decided to travel via Mangalore to change things up. I have about an hour and a half. Within this time, I need to each lunch and travel to Mangalore Central, from where I will take a second train to Aluva. Are there any buses available on Sunday afternoons which go to Mangalore Central or will I have to pay more and take auto? Also any suggestions of good restaurants on the route are welcome.