Hi there 
If you’re building a gaming merchandise store, I’d focus on keeping things simple and scalable from the start.
For themes, many gaming brands do well with clean, fast themes like Dawn (free) or premium themes such as Prestige, Impulse, or Motion, depending on the visual style you’re aiming for. Gaming stores often have lots of images and collections, so speed and mobile experience are usually more important than flashy effects.
For print-on-demand, I’ve seen many merchants use Printify or Printful because they integrate well with Shopify and make it easy to expand your catalog without holding inventory. If you’re planning to sell digital downloads as well, Shopify’s digital product apps can handle file delivery automatically after purchase.
On the SEO side, I’d make sure every product has a unique title, meta description, optimized images, and descriptive URLs. Since you already have an existing gaming website, I’d also look for opportunities to link relevant content between your site and your Shopify store to build authority and drive targeted traffic.
For page speed, try to avoid installing too many apps early on. Large image files, excessive animations, and too many third-party scripts are often bigger performance killers than the theme itself. Test regularly on mobile since that’s where most visitors will likely shop.
One other thing to consider for gaming merchandise: personalized products tend to perform surprisingly well. Things like custom gamer tags on shirts, personalized posters, custom usernames on stickers, or fan-inspired collectibles can help differentiate your store from others selling similar products. If you decide to offer that kind of customization later, an app such as Easify Custom Product Options can let customers enter custom text, upload images, choose designs, and personalize products without creating hundreds of variants.
Overall, I’d prioritize this order:
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Fast theme
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Reliable POD supplier
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Strong product images and descriptions
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SEO fundamentals
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Mobile optimization
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Product personalization and upsells once traffic starts coming in
That foundation will usually have a bigger impact on sales than installing lots of apps on day one. 