I suppose you need a safe place to work with good ventilation, and low end chance of fire hazards, at least some part of the day or year (you can do some of this out of doors under specific circumstances. You need eye protection equal to the level of brazing or welding you will do, so not too much for silver, more for brass, sameish for gas welding, lots more for arc. There is a lot more to the safety side, and that is one thing that Paternek does cover better than anyone I have seen, in his videos.
Next you need to decide how deep you want to get into it for your first attempts. If you decide on silver for your first work, you can do some playing around with propane or Mapp on small stuff like rack tubing. In theory you can do whole bikes with these torches, but if you intend to move on to a proper torch, then you don't learn much about handling one of those by pushing the envelope with the small torches.