Welcome to the forum.
You've made one huge step in the right direction by buying raw leaves.
Tailor-made cigarettes have a staggering 300-600 added chemicals.
Pipe tobacco has none [Some blends have a little harmless PG as a humectant]
I was a slave to cigarettes for 35 years. Over ten years ago I switched to a pipe and smoke blends with mild Vit N. What a difference it's made.
Now I smoke for pleasure rather than addiction.
Info on casing/toppings, recipes in particular, are extremely hard to find.
The link given by
@F4RM3R says that ALL tobacco has been cased with sugar. Although many will disagree, I've read this many times before [Apparently tobacco is much harsher without]
Over a decade ago I grew some Virginia. At the time I could not find any info on growing or casing tobacco so I winged it.
The leaves were brittle so I sprayed them with a mix of water/port/brandy [50% water, 25% each of port and brandy] dried and sprayed again.
Once dried the leaves felt like soft leather. It turned out to be a rather nice smoke. The sugars in the port must have been sufficient.
Friends also found it a reasonable smoke.
A total fluke but there you go.
www.fairtradetobacco.com forum may be of help.