Hopefully you're just talking about getting the bolt back into the action.
Pull the trigger part way back and set the bolt in place, pull the trigger back slowly until the bolt will slide home.
Be sure the ejector is in place before you install the bolt. It's that flat piece with a sort of a shark fin on it. You may have to push it down a bit to get the bolt to seat.
If you took the bolt apart you're SOL, you'll need to take it to a gun smith.
Take it to a gunsmith
it depends on the model.
How do you put WHAT. A pellets in the rifle, a BB in the rifle, Put it back together. your question is incomplete.
That question can't be answered as asked. It depends on the brand and model. Check with the manufacturer.
See the link below for the parts diagram.
the only way it will ever be put back together is to take it to your local gun smith
It depends on the brand and model. Check with the manufacturer for an owner's manual.
If you took it apart without an owner's manual and now can't get it back together, find a gunsmith.
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What type of model tries to put mini ideas together to explain or summarize something