ok, but please if u have picture of serial communication with pic18f4550?

[...]i don't know how to connect RS232 with pic18f4550?

You suggested you were going to use a MAX chip.. namely, I'd assume, the MAX232....
There are lots of projects that utilize the MAX232 chip, so there's no shortage of examples...
http://www.petervis.com/electronics%20guides/MAX232/MAX232.html
http://en.wikibooks.org/wiki/Serial_Programming/MAX232_Driver_Receiver

 

The LM35 outputs a linear voltage 10mV per °K.

Are you going to use the PIC on-board ADC?

Have you considered using the Maxim/Dallas one-wire temperature sensor such as the DS18B20? More software but less analog complexity.