Let me try ,first off I'll tel you what you should have
1. Complete bolt / extractor,firing pin and spring all pins should be flush with outside of bolt
2.trigger mechanism group/complete/trigger ,safety hammer ,hammer strut,hammer spring,disconnector,cartridge lifter all pins and springs in place/when installing hammer shoul be cocked/ do not release hammer with trigger without"riding"the hammer down with your thumb,if you do the hammer can over extend and release itself from the strut,fixable but PIA.
3.operating Rod spring,about 4"-5" long3/16" wide .
4.operating Rod apprxm.1 1/2" -2" long looks like a thin round headed nail
5. Bolt handle,L shaped piece of gray aluminum with a round handle or hook handle,it will fit the 3/8"
groove across the top of the bolt
6.ejector / hopefully installed inside receiver alongside chamber
These are the parts in the receiver group if they are there proceed
Install the operating Rod in the operating Rod spring ,ball head stays out the end,looking in the recievr from the bottom at the back on the left hand side is a round ,shallow hole,the operating Rod "ball" insets there.
The other end of the operating Rod group,the spring end is inserted in a hole in the rear of the bolt on its left hand side,slide the bolt in and down at an angle to the rear,feeding the spring into the bolt as you go,this will require some strength and dexterity to keep the spring straight as you go further in the Rod inside the spring will enter the hole in the bolt when it does you have almost got it in,do not release the bolt until you have it all the way down to the rear and back of the action,still do not release it!THEN lower the front of the bolt keeping pressure on it until it is against the top of the receiver and able to slide forward engaging the ejector into its slot in the right front of the bolt,if it slides forward into battery it is secure for the moment.
The next task is to install the bolt handle,to do this you have to slide the bolt back to its open position,then you must lift the front of the bolt approx.1/8"-3/16"so there is a space between it and the top inside of the receiver,now,The bolt handle.the round portion or the hook ( the bolt handle)stays outside the receiver ,the square L shaped piece must be inserted in its slot in the receiver( the thin slot at the rear of the ejection port)there is now a section of the bolt handle between the bolt and reciever,this must be pushed towards the rear raising the bolt enough to accommodate its movement rearward ,(but ,remember do not raise the bolt further than neccesary,do not release the bolt,)/the bolt handle is moved rearward until it engages its perpendicular slot in the top of the bolt when it does the bolt will again be able to go tight to the reciever top and also slide forward into battery,if and when it does the battle is pretty much accomplished and the trigger group can be installed and the rifle stocks assembled and installed reciever group done.i hope this helps.