If your on a tight budget and not working with super close regestration (like one maybe two color golf balls) then u can use a $25 can bondo and wood or alluminum stock that you can get at home depot.
If you need some do it your self directions i can help you out.
But if you got the budget go for padprintersfla's idea
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:D Your best bet is to find a local source like an independent tool maker. Somebody that is retired or something similar. You will need this person to understand the pad printing process and work with you in designing the fixtures. If you do not have someone like this near you than it will be kind of hard to keep your tooling/fixture cost down. I would stay away from making fixtures out of wood and glue etc. I just had a tool made for some cups with a nice aluminum base. I poured some replicator solution inside a cup to capture the inside of the cup. The handle for the cup is supported by a softer nylon material. Came out real nice. I paid the guy $125.00. It is worth every penny. I use my source for tooling every time and that helps keep my tooling cost down. I could have easily paid $500.00 or more with some of the larger companies. Good luck.