Got this recipe from a staff member at Sea Run years back and it's all I use now. Still experiment with random brines from time to time as it's cheap and easy and tastes great!
1 cup regular brown sugar (the light brown stuff)
1 cup demerara suagr (dark like molasses)
1/2 pickling salt (not iodized table salt!!!)
This is about enough for 3-4 average size fillets. Make more of less mix and jst kep same ratios.
I keep the skin on but you can remove it. You can leave the fillets whole or cut in strips. Marinate fillets for 18-24 hours. The mix will go on dry and turn to a snotty liquid as the salt pulls water out of the meat. This is normal. After time is up take fish out and pat dry with paper towel. DON'T rinse with water.
Lay fish out on cookie sheet(s). Brush with maple syrup and crack black pepper over fish. Let sit ANOTHER 18-24 hours. Put saran over fish or you could use a container that seals.
Now put the fish on your smoking racks. You can smoke it up right now but I like to dry the fish out a bit. So I have a fan blowing on the racks in the smoker for 6-8 hours. I try to get up early like 6am or so, get the fish drying, then get it smoking after lunch.
I do 3-4 pans of chips usually a mix of cherry, alder, etc. I wouldn't recommend hickory or mesquite but that's just my preference.
3-4 pans takes my L-chief about 3 hours. From there I just leave it until it's how I like it, about another 3-5 hours.
This time of year I find the L-chief doesn't heat up worth a crap. I built a box that goes over it with a removable lid to adjust the heat. If you have a cheap smoker like mine you will likely have to rig something up or you will more or less be doing a cold smoke.