You have mentioned in your question that you have the developer/design talent available and you already have your first contract and have some leads for the next, so I believe that setting up an online shop will be the best one. To create an awesome mobile dev online store, keep the following points in mind.
1. Engaging Web Design
According to a Kissmetrics study, 93% of buyers consider visual appearance to be the most important factor when making a purchase. To create a profitable online store, you can either pay a pretty penny to a web designer or take it upon yourself to learn to code.

2. An Awesome “About Us” Page
If a visitor goes to your “About Us” page, that means they are already interested in you and are giving you a chance to prove to him or her that your product is the best. All testimonials, achievements, and any kind of social proof is welcome there. Some online stores, like Tens in the example below, opt for a minimalist design to keep information clear and easily comprehensible.

3. Offer Excellent Online Support
Your consumers need to know they will have support after they make a purchase, if needed. Guaranteeing troubleshooting after the purchase and consulting before the purchase can convert potential buyers into loyal, returning customers. The company keeps the chat feature easily accessible, yet unobtrusive to buyers in the bottom left-hand corner.

4. Provide Popular Payment Options
No online store can exist without payments. Offer a wide variety of popular payment options for your customers so they can always easily make a purchase.

5. Advertise on Social Media
Advertising on social media channels is a powerful way to connect with lots of potential customers in creative, fun ways. Use tools, like Google Analytics, to track which channels your target customers are using most and focus your marketing efforts on these platforms. Here are a few actionable tips for advertising on social media.

6. Make Your Site SEO-Friendly
Your online store must receive traffic in order for purchases to happen. By incorporating SEO keywords into your product titles and descriptions, your site is more likely to rank higher in search engine results.

7. Ensure Your Store is Mobile-Responsive
Mobile shopping accounted for 30% of online purchases last year. With the growing use of phones for online shopping, merchants must ensure that their site design is mobile-friendly to make sure buyers can make purchases, no matter what device they're using. Merchants can also use online store design templates that are already set to be mobile-responsive to make their site device-friendly.

8. Track Analytics and Iterate
Online store owners cannot improve their growth strategies without monitoring their progress. You can easily set up Analytics for your online store by following these instructions. Merchants who need help setting up Analytics or are unsure about how to form data-based insights should check out our guide to using the tool with your online store.
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath