1st suggestion is to see what firearms you have with threaded barrels now. Then decided what you are going shoot the most of that has suppressor capability. If you have a rimfire threaded barrel firearm then that's where I suggest starting. A Dead Air Mask HD is the #1 rated rimfire suppressor. Matched with .22lr 45gr suppressor ammo is the quietest thing I've ever shot. Suppressors can open up a whole new expensive can of worms but fun.