I've made gravlox many times. The "standard" recipe is:
1) Make a 50/50 mixture of canning salt and table sugar.
2) Grind in some fresh black pepper to taste (in my mind, the more the better)
3) Place the fish in a glass dish. Cover with above mixture. Cover that with a layer of fresh dill.
4) Overlay this with saran wrap and put another glass dish on top of that. Put something heavy in the top glass dish. A brick or two works as does some canned food.
5) Place the assembly in the fridge for approximately 24hrs - thick pieces take a little more time, thin pieces less.
6) Pull it out and rinse off the salt/sugar mix.
7) Slice it thin and eat with good bagels and cream cheese.
If the above is too salty for your taste, adjust the mixture to have a greater percentage of sugar - I usually am at about 40% salt, 60% sugar.