Hi petersenj20
(1.) this is when the router table fence will come in to play,but if you don't have one the guide board will work just fine
(2.) aging the fence will do the work for this type of cut,just cut out some spacer blocks on the table saw, make your 1st pass on the router table,then put your spacer block in place and move the fence back to the right spot then make your 2nd pass ,3rd space,reset the fence aging, and just keep going until your done.
Bob and Rick says this all the time down use a ruler and it's true use a spacer block and they will look great when your done.
Bob has a tool I really like it's called a RUBBER Ruler
http://www.pbs.org/routerworkshop/
703 - Trivets, Trivets
http://www.routerworkshop.com/S700.html
Bj