Well, first of all you need to control the spin via the rudder input (not sure how your setup does that) and you need to be aware that the liftoff position of the stick is definitely far from neutral - you need to determine the required position when the helicopter is on the verge of lifting and just starts to skid in small steps - the position where it doesn't skid in any direction is the one you want.
For most helicopters (especially the R22) this is rather difficult and needs lots of practice to get right, so it's not surprising that you lose control, it's normal.
Could anyone explain in simple terms how to fly the helicopters with my setup?
No, because it's actually complicated, both conceptually and from the required hand-eye coordination, so it can't be put simply, but you will find a good guide in the wiki.
Anyway, the Alouette-III has a working co-pilot who can take off and land for you and you can take the controls in air (which also needs some practice, but is arguably easier than doing it yourself - that's intended so that you can get some feeling for how a helicopter feels in flight and with that knowledge come back to learn to take off.