First Time Offset: Can’t Get Up To Temp

Hey guys, first time smoker here. Using this thing the tenants before me left behind. Doesn’t look too great but we’ll see what we can do.

Struggling to get it up to temp. I got a little first going in my charcoal chimney then threw it in the offset. Got all my vents all the way open but fire doesn’t seem to be taking in the firebox for long. At first there was a bunch of smoke (the thing bleeds from every seem lol) but it seems to die out pretty fast and I can’t really get above 100F.

Tried propping the firebox open a little but still that’s not really working. Any guidance?

Thanks!