I replaced both Air/Fuel Ratio Sensors 1 with Toyota part 89467 48011 0n Bank 1 and 2; all six NGK Spark plugs and six coils on my 2000 Lexus RX300; reset alll error codes with OBDII. Took for test drive and the check light started flashing after 5 miles; came back and read the error codes.. I now have P1150, P0172, P301, P302, P304, and P306. Can some one recommend a solution or direct me where the problem may be. Any help is appreciated.

Take it to Autozone or Advanced, NAPA etc. They can read the codes and tell you.

P1150 and P0172 are both Fuel Trim related but what most techs don't understand is that the Fuel/Air Ratio sensors are reporting a condition not necessarily indicating a fault.
What is of more concern is those misfire DTC: P03xx. If those are persistent, they could be the cause of the CEL flashing (flashing indicates potential converter damage from misfire)
Have the fuel injectors been professionally cleaned? Make certain the entire air intake system is intact and it has no leaks.
Get this into a qualified shop and have it checked out before anything serious can happen.

A flashing CEL is a serious warning. Fuel may be building-up in the catalytic converter and exhaust system. If you don't get this fixed ASAP, you may blow the exhaust system off the car. Don't overlook hose/vacuum leaks, which can end up affecting fuel trims and misfires. Any leaks in the brake booster?

Take it to Autozone or Advanced, NAPA etc. They can read the codes and tell you.
I own the error reader and do not need to go to these stores. Thank you for your guidance.