If you want something very visable and that will burn well try a low cost 1W
(1000mw) 445nm blue
I agree 100mw 532nm green is a good best of both worlds choice--very visable, and some burning ability while you become more familiar with lasers.
Safety is of utmost importance---protective eyewear is a must.
Read and learn as much as you can about lasers and laser safety.
100mw 532nm green can be dangerous and can do eye damage so fast that you have no chance to correct the error.