You can begin with wordpress + woocommerce. Both are free. If you're in India I can tell you how to setup a free-of-cost but top-quality Indian payment gateway on your site. You don't even need to be a offline company for that. But that is for Indians. If you're outside India, you can set up Paypal Business account
here at least, and some other free but pro-quality payment gateway on your site... There are plenty of woocommerce related free and paid plugins to chosoe from. There are also some free wordpress plugins to set up your specific website, e.g.:
Google:
t shirt wordpress plugin
You can use one or many of the BST services to get you up in SERPs, get traffic, begin doing social networking, etc. If you know SEO then you can use it effectively. There are some dropshippers in the niche too. You can sell custom t-shirt designs on your site and for that you can talk with local custom designers, or find online designers by doing G search.... there are plenty of youtube videos to show you how to achieve things that you will need from time to time in regards of creating and operating your website and business. You can also sell your products on Amazon and ebay, etc. Whatelse...
T-Shirt is only one example I have given, but you can use the idea to sell different apparels once you know the tricks. I am also a seller on ebay and have my own wordpress+woocom site where I sell clothes. I began same like you, on square-one and with zero knowledge about everything. I only had a great supplier whose designs are very beautiful and famous offline. I just put them online, first with ebay then on my own site, somewhat successfully too.
Btw I had no money to spend on this niche. I began taking photos of the products which my friend had in his factory and on his wholesale shop. I put them on ebay and then bought and delivered from him to the new customers. That way I got the money to invest more, and the dedicated site came up of course without spending on anything else other than the hosting and domain name. The WP, Woocommerce, payment gateway, plugins are all free. So don't worry about the costs if you've a product line ready to sell.
