First thing to do is make sure your diesel filters are clean and full of fuel. If they are old or not been replaced then get new ones and fill them with CLEAN diesel fuel before screwing them on.
Next crack the fuel lines at the injectors. Just crack them do not unscrew them.
Then have someone crank the engine until you see fuel leaking from the cracked fuel lines. Stop cranking then tighten the lines up again. This should get the bulk of the air out of your fuel system.
If you still have problems then repeat the process until it starts. You do need a experienced mechanic to make sure your fuel pump timing is correct. But that can be held off for another day. Not to long or your exhaust will get clogged up again.