Just to add to this old thread
LPG is really only good for cutting as it does not get hot enough for a good welding flame...
the torch has handle should have 2 valves one for O2 and one for Fuel( LPG in this case) then their will be a connection for either Cutting or welding tip,the cutting tip will have another adjustable valve and a cutting lever...
there will also be 2 regulators one on the Oxy cylinder and one on the fuel cylinder,these will have either one or two guages on them,if 2 guages then one is cylinder pressure,and the other is delivery pressure which is adjustable,I am not sure on the fuel adjustment for LPG as I have always used Acteylene,the O2 pressure will vary as to fuel,tip size,and whether you are welding or cutting ( typically a higher pressure when cutting )...
The torch handle valves are used differently depending on if you are cutting or welding, both are used for the fuel/oxy mix when welding,only the fuel is used for adjusment when cutting and the O2 should be fully open then back 1/4 turn,the oxy adjusment for flame while cutting is adjusted via the valve on the cutting head...
adjusment of the flame is a science/dark art best bet would be to watch some one or maybe see if there is any Youtube videos
with cleaning the tips,get tip cleaners and use the appropriate cleaner for the size of the hole, the cutting tips will have a larger centre hole surrounded by smaller holes,the smaller holes are the ones for the flame the larger centre is for the blast of oxygen..