Looks like boxcar and icepick scars. Do you only have scars on your forehead and temples?

No reason to wait for a serum or topical to start needling, just add that to your next treatment if you find any to use. A dermastamp is great for targetting scars, but for full face treatments it will likely take a very long time. 1.5mm is at the upper end of needle length for the forehead, you might be more comfortable starting with 1.0mm.

I would also consider TCA cross for the icepick scars and some medium chemical peels to promote collagen and even out your skin texture/color. Take a look at the FAQ thread if you have not already done so, some good info on all of these treatments.

thanks I did guess ice pick but wasn't sure it's hard to tell on yourself when you spent years looking at your scars lol ,I will check out the FAQ, I tried derma rolling a couple of years ago but wasn't keen as wasn't sure I was doing it right so ordered the stamp now heard better things and seems more straightforward thanks for your help 

Some scars are difficult to identify, I think scars on the forehead are especially difficult because everything is shallower and it seems to be less common.I prefer the stamps to rollers as well, but it takes a lot longer.

Have you tried any treatments other than the dermaroller before?

I see no ice picks in those pictures, only boxcars and maybe rolling?