MS-Access Check box IF statements

How would i add a check("chk3") that will be ticked when ("Customer order Number") field has been inputted. when an order number is entered, then the check box will tick..

i also would like to know if it is possible that When the value field ("Value") is under £10,000 then the check box ("chk2") will tick. if it is over £10,000 then it will not tick