Saw mills, wholesalers, bring your trailer. Deal in board ft. Eye every inch of each
You need the proverbial "river of wood" to match your turn-key setup. Fifty shafts will get you into your first cues, about five years from now. Five hundred shafts would be the right number to establish seasoned shafts for your cues in the future. You can add more inventory each year(couple hundred) to maintain that consistency of quality shafts.
The same for other woods. Buy as much Gabon Ebony and Mexican Cocobolo you can afford. Get that river flowing as well. If you can by old growth Brazilian Rosewood, do it. Pass on the reclaimed stumpwood. My guess is you will strike out here. Again, buy as many pieces of each you can afford, hand picked instead of mail order. Boards of 8/4 x 72" would be my pick over turning squares. That is not going happen with Ebony easily. You will need point stock too and turning squares leave nothing but dust, plus having the same wood used in each cue is a desirable and highly marketable feature. Cut it up and date it, use it when it has aged properly.
Buy Maple, tight straight grained hard rock, Birdseye, and curly by the 8/4 board too.
Hand pick the boards, no mail order.
Doing veneers? cut, dye and glue up your own. Points, rings, fronts, handles Inlays, get Ivory now, while you still can. Exotic woods? They never get cheaper so buy now in sufficient quantities.
A quality, heavy band saw will be one of your most used machines to get that high quality stock cut into the sizes you can use. Get the best you can afford, my choice would be one with a 3/4" blade capacity. You will need another band saw for metal cutting, same quality here on a slightly smaller scale.
I don't know how many lathes you bought but take a look at Ernie G's shop, a dedicated metal lathe for every operation in cue building requiring a lathe. Precision at every step without having to retool anything.
CNC machines for tapering and inlaying, again, dedicated to the operation at hand. The heavier the better for the inlay machine. Spindles, mills, and lathe tooling need to have redundancy for obvious reasons, get the best.
Buy raw stock and make your own parts, separate yourself from the mail order cue makers, it will be worth it in the long run. Others should not be offended by the previous statement, everyone's situation is different and one should never pass on the opportunity to separate from the pack. It gets you noticed and if you have high quality work it will create an insatiable demand.
Scrap the man cave and use every inch of the area for one thing- making cues.
Once you develop a cue that has the feel you want, stick with it, consistency rules.
This may seem over the top, but I like cues like that. What's the saying? - Unnecessarily well made.