need some help with a project

[bob_man_uk]

i hope you dont mind but i have a project to do and I need some help with quite a few aspects of setting it up,

let me lay it out,

The project is commissions,
at present it is on paper, it is required to go into a mySQL database,
i need to use access to ADD/Modify existing entries

what I require,
i already have the commissions in a database, which need to be printed (no problem there)

I have made a link table in access, but i need to restrict what data the user can input, ATM i have tried inputting data VIA the web pages, but I cant force the input data to fill in certain fields, which I need to be able to do,

if you have any ideas then please let me know,

thanks
mattyG