RE: First jump plane?
Welcone to the hobby of R/C Skydiving.
Check out the area R/C swap meets, Just about any .60 size trainer with a .60 or .90 size engine can carry up a 3 lb. jumper.
My drop plane can carry up to 3 - 4lb jumpers, and my friends will carry the same.
When we are at the field practicing we use a PT 60 trainer 6ft. wingspan (his) with a .91 OS FX engine (mine) and a single drop set up, to carry up 4lb jumpers. He and I both have jumpers from rcdropzone.com and I have a 'Mike" from Paramax in Germany, and a home made jumper with a canopy from TV Products in Belgium.