They will not give 5 year if you renew when you are on a tourist visa. Some might, of course, but the latest news say they are not going to continue with that.
Go to your local DLT office and ask what they require.
If you have a license back home and a International Drivers Permit you may be able to convert this to a Thai license without too much problems, but I heard they were changing that so you'd need to do it all from scratch. Not sure how far into enforcing that they are.
You would need to watch a 1 hour movie with some questions, and do a eyesight ( color ) and brake-test at the DLT if they still allow simple conversions.