Hello...
The attached screenshot is from INA114 datasheet, which explains the basic connections of this instrumentation amplifier.
My questions are:
1) Should I have to use two 0.1micro-F that connected to V+and V- ?
Always! See 1st paragraph, page 8 of the datasheet.
2) What should be the value of load resistor (Load) that connected to pin 5&6 ?
According to the datasheet, it should produce a current on the order of 5 mA with 15 mA as the maximum short circuit current. So, 5 mA is a number.
At the very top of the table on page 2, it talks about 2k Ohms. So, that's a number and it represent all of the devices the amp connects to. You wouldn't ordinarily have a load resistor, you would have further circuitry that presents a load.
Notice that the product of the recommended resistor (2k) and current (5 mA) yields 10V. This is a magic number, the maximum + or - signal voltage usually associated with a device powered by a +- 15V supply.
An observation I made many years ago: Every single number in the datasheet imposes a limit on how I can use the device. I need to understand them all!
http://www.ti.com/lit/ds/symlink/ina114.pdf