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Before we can help you, we need to know what country this business would be in.
I haven't heard back on what country you are located in, so I will assume America and go from there.
Have you ever thought of starting a franchise trophy business? The advantages to that would be in their training you in the business. You wouldn't be left on your own. Here's a link to one. http://www.entrepreneur.com/business-opportunities/crowntrophy/32960.html
Here's a good website for entrepreneurs. It's not trophy related, but it has a lot of useful information on getting started and how to run a business. http://www.entrepreneur.com/howto/index.html
Here is a link to trophy wholesale suppliers. http://www.google.com/Top/Business/Consumer_Goods_and_Services/Awards/Supplies_and_Equipment/
It would be hard to tell you the start-up cost, since this would depend on a lot of factors, but here's a website that will help you calculate the costs with a "start-up cost calculator." http://www.businessknowhow.com/startup/startup.htm
Here is a link to a free, interactive workshop put on by Regions Bank. It covers starting your business, managing your finances and marketing your business. http://www.regions.com/business_resource_center/online_workshops.shtml?source=ga&lc=all&kw=business+plan
Here's a site for "Entrepreneur Training." It can be done on-site or over the telephone.http://www.growthsuccess.com/training.htm
I hope you find all of this information helpful and you will accept my answer. If you need something more, let me know. Thanks!