Ive got 2 torch setups here at home,
Others at a shop at a friends.
One is a standard H/D Victor & the other is a mini jewelers oxy/Ace setup that also has the adjustment valves on the torch handle just is tiny in size. Safety here is the main issue im getting at since the OP stated he has no instructions, Ill set forth a few. Both setups I have Ive placed the tanks in a poly case so no way can they fall over accidently but even a dolly with straps will do on larger tanks & I have the poly cart strapped to a dolly for easy movement about, also on both. next thing is do not even consider to use a torch that also uses Oxygen unless it has check valves AND flashbacks on the regulators period. One note, always, always start the flame using the gas fuel first THEN turn on the Oxy. Do the reverse when turning the torch off, Oxy first then the gas.
Also, so you do not damage the regulators diaphragms slightly open them BEFORE opening the main tanks, otherwise damage may occour to the regulators. Keep the torch handle valves closed when doing all this then, at the point your ready open the Ace handle valve & let it run till you smell gas then shut down the valve. next open the Oxy just for a sec or so to purge that line then also close the valve, now you are ready to ignite the Ace & adjust the flame. Turn the gas down till it stops smoking than slowly add Oxy & adjust both for a neutral flame, that is a nice pencil point blue flame within a outer flame. If it pops you set the torch vale too low or your too close to your work. The torch head will dictate the pressure needed, smaller means less pressure such as on my jewelers torch which only requires 1 or 2 lbs pressure, the regular standard torch will use 4-6lbs on the Ace & 8-11lbs on the Oxy for say a #6 tip size. Unless your melting a huge amount a smaller tip will be better since the blow pressure is much less, intense heat not pressure is what you want that is why I like the mini jewelers torch so much for PM recovery projects. Reaches over 6,000 degrees with a tiny flame & uses almost no fuels. Well worth buying one over a conventional torch IF your only using it for PM use. You can get a nib jewelers torch setup on Ebay for about $60 complete with several tips & the mini 1/4" hoses that do hook up to a regular regulator.
I weld with a mig & an arc & the Ace/Oxy, all have their particular usefulness, mig is nice due to minimual sparks & really solid hard weld, can almost weld in a teeshirt also. Arc is fast & dirty but fast, gas is nice for melting & heating things. Best of luck & if nothing else download a manual & get those flashbacks & checkvalves ASAP if you do not have them. Some torches have built in check valves but the flash backs attach at the regulators then to the hoses.
I hope ive helped from a safety standpoint.
Dave