If you are an appropriate candidate, MRC will provide counseling and evaluation to help you determine if your vocational goal is appropriate. It also offers job placement services. You may be asked to do some market research to find out what kind of additional training you need to obtain an entry-level lab job. Make sure the position you target is one that will not put additional strain on your injured knee by requiring you to stand for an extended period. I encourage you to consider retraining, whether through MRC or on your own.
More education means more money.
You asked about developing a coherent resume with your experience to date. If you are looking for a lab position, you might want to highlight your education and list the relevant coursework, including your concentration of science courses. Your work experience, although not in a related field, would indicate you have a good track record and have been able to do well on a job. You can also get a general employment reference from your most recent employer. Although applying for some of these programs can appear frustrating, and the timing may be slower than you would like, I would encourage you to follow through with the appropriate resource.