What do you want to achieve with your marketing? What are your marketing goals and objectives? While in most cases this will be an increase in sales, you may want a more professional look, a new website, or just to outsource a particular channel that's taking up too much of your time.
What service do you need?
Think about what services you need. Is it just a specific service – say a new website, or an agency to take care of your search engine marketing, or maybe you just need graphic design? Or do you need a full service – and organization that handles all your marketing, maybe an organization that manages your marketing strategy by providing you with only one point of contact? In this case, you can hire a full-service marketing agency in Texas via https://www.scaleyourbrand.com/.
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Make a budget
Identify a marketing budget upfront, at least a ballpark one, and this will save you and any agencies you talk to time. Getting marketing right can require a decent marketing budget however if you get results and an ROI why wouldn't you pay as much as you can afford? Don't just go for the cheapest; make a decision based on a number of factors. Be realistic in the size of the agency you could engage but remember the alternative to outside help is employing someone to do your marketing.
See the experience
Whichever agency you hire should be able to show you case studies and portfolios of their work. Have a look, and see if you like what they come up with, their thinking and creativity. While experience in your industry is helpful, don't turn down a marketing agency that doesn't have that particular experience. What matters is that you will be proud of the agency that can do for you what they have done for their other clients.