Will change oil and oilfilter.How much oil and what kind of oil is the best?

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You must have missed the rubber ring from the bottom or the oilfilter. If this ring is not there, it takes a while before the pressure goes up.

Make sure the mating surface is clean, next lube the gasket in the oil filter with some fresh oil using your finger. Tighten 1 1/2 turns after gasket contacts. If this doesn't work it might not be the filter that's the problem...

the amount of oil to refill the sump will be the regular amount plus 1/2 pint for the new filter. You will need to know the sump capacity ( from a owners hand book for your engine)

There are a few posibilities:
1) the oilfilter needs cleaning
2) your pressure reduction bore needs to be changed
3) there is still some air left in the oil-tubes coming from the tank and leads to your burner
The best solution is to call a technician, he'll fix the problem in no time and while he is at it, perhaps he could perform a maintenance

IS THE ENGINE REMAN OR SECONDHAND IT SOUNDS IT MAY HAVE RUN WITH OUT OIL, KNOCKING NOISE SEEM TO BE A BEARING KNOCK .WHAT I SUGGEST IS TO REMOVE ONE HT LEAD AT A TIME IF KNOCKING SOUNDS SOFTTER ON THAT CYLINDER THEN IS AS ABOVE

Whipe all the area around cleen, fill the oil level, start the engine and see where is leeking.
If its oil filter gascet leeking, change the oilfilter, clean all htat area and see if it still leeks.

If leek is somewhere else, you may consider asking for help in car service.

It is rite on the right side of the oil pan

You didn't post the size of motor but once you drop the skid plate, you will see it.

The oil filter is under the engine skid plate. You need to remove the trap door to see.
The skid plate door is located by the drivers side door, directly midway underneath the vehicle. You will need a flat or Phillips-hear srewdriver to open the trap door. Don't worry, the screws are 'loss-proof' and will not fall off the trap door plate. Once this has been removed, the oil drain plug and oil filter are now visible and accessable (how smart is that!) Typical oil change and oil filter replacement time = 15-20 mins. for a familiar shadetree. p.s. The Inline 6 (24 valve - 4.2L) takes 7 quarts of oil. Good luck!