My pick-up truck wont start it had a bad starter so i replaced the starter, then the battery died....but in the same day...i decided to just use other truck and give it a jump start, but my truck was only making this clicking noise "sound" very fast..... i am very frustated....i need some advice......i need it so i can go to work.... PLZ..

Based on your description, the starter selenoid is not getting enough juice (current) to pull up solidly. So, causes are:
1. Low battery voltage
2. bad connection of battery+ at the battery or at the selenoid terminal.
3. bad ground connection between the starter selenoid and the truck chassis.

If you want to bypass the selenoid, you can place a jumper cable on the "FAR" side of the selenoid (the side that feeds the starter). Then momentarily touch the other end of the jumper to the battery + terminal.

If the starter cranks, then you have confirmed the selenoid as problematic. Remove it and either replace it or disassemble and clean it.