bulk sms with automated response

This is an information request system via sms. Example: client text- yard sales, charlotte, today company text- weve found 3 click the link Client follows the link to a webpage that has all information. 1) Send bulk sms 2)Receive sms and input data to excel/MySQL 3)received sms can request info from excel/mysql server. 4)excel/MySQL auto responds to info request and returns text. the general idea is for clients to be able to text information to database that can recall and resend information when another client inquires. it needs to be fast. since i have no real experience, i need someone to suggest the most effective way to get this done. ****I need a software or script built***** in simple terms---I need free sms bulk mail system that is linked to a database that can send and receive sms automatically. please contact. if you feel like the budget is not enough. counter. please have some experience.