I good way to start is read about www.west-wind.com . An excellent product for internet applications based on foxpro.
Also you can use a COM object, to pass the data as a parameter,make any validation using your VFP code and execute your SQL and even you can return a record set with all the records that you need.

Your code COM code could be:
DEFINE CLASS myObject AS CUSTOM OLEPUBLIC
lcData="g:\data\"
cMessage="Nothing"

FUNCTION INIT
SET DELE ON
SET EXCL OFF
DODEFAULT()
ENDFUNC

FUNCTION TEST
lcMsg="country>Current Directory:"+ CURDIR()+" TEMPDirectory:"+SYS(2023)
RETURN lcMsg
ENDFUN


*

*- Retrieve a record with user info
FUNCTION UserInfo
PARAMETERS lcUserName,lcPassword
SET EXCL OFF
lcUserName=ALLTRIM(UPPER(lcUserName))
*lcUserName=PADR(lcUserName,10,' ')
lcPassword=ALLTRIM(lcPassword)
THIS.cMessage="0"
con=CREATEOBJECT("ADODB.Connection")
lcOpenstr="driver=Microsoft Visual Foxpro Driver;Exclusive=No;SourceType=DBF;SourceDB="smdata;pwd="
pwdcon.OPEN(lcOpenstr)"
*con.state
rs=CREATEOBJECT("ADODB.RecordSet")
lcstr='Selec * from smcust00.dbf where ALLTRIM(cuser)+ALLTRIM(cpassword)=="'+lcUserName+lcPassword+'"'
rs=con.execute(lcstr,,1)
RETURN rs
ENDFUNC

ENDDEFINE