Start with small catering jobs. Some pit mfg. have catering and restaurant classes so I would check them out. This is a business and it requires that you never forget that, you need to do food costing and especially you need to know marketing. Get your ServSafe certification and volunteer your labor to other caterer's who are not in your marketing area before you do anything. Insurance, certified kitchen/commissary, licenses and health dept. approvals. It is hard work but if you love it you will have a job that you enjoy doing.
Most important, only invest what you can lose.