I'm having a lot of problems doing a grayscale photo on owwd can someone tell me the best wood to do this on and some what of the settings thank you

Hi can you please tell me what size w laser this is? And the font is not working on the cncc laser software. After I have select the font type and size and click OK, a different font appear on the cutting screen. No matter what font I choose it keep giving me the same type of font. Please help