Best... who the hell knows?
If you want advice on something that should work for you until you gain some experience, then buy,
A TC Encore FX and mounts or an Omega
A couple of packs of Harvester Crush Rib .45/.50 sabots (.45 caliber bullets in a .50 caliber rifle).
A couple bottles of BH209
100 Hornady 250 grain XTP .45 caliber bullets.
200 209 or 209magnum primers (not 777 primers)
A pack of good quality cotton .50 patches and a .50 bore brush.
Cleaning solvent
A ML range rod with a muzzle guard and a .50 caliber jag.
An adjustable powder measure with a sliding funnel on the end.
12 to 18 BH209 charge tubes.
A small possibles bag for your stuff.
A 209 primer holder
Although you may not need it, a polymer short starter might be handy.
Anywhere from 80 to 100 grains (by volume, not weight) of BH209 is all you'll need to kill deer.
Do some reading. Follow the instructions that come with the rifle, especially the safety and maintenance stuff. Go to the BH209 website and read everything.
The list above ain't perfect, and others can and will disagree about some or all of it, but it should work. Put in the time it takes to get familiar with your rifle and the loading sequence before you head out to the woods. As others have remarked, muzzleloading takes time and effort and if you think it sounds too involved, maybe it's not for you.
If anyone notices that I've left something out, please chime in.
