I'd put some serious thinking into where you want to go on your chicken journey. If you intend to take the plunge, consider starting with a secure run. You'll want one of those either way and they cost less than the coop. Get that tiny coop into a secure run. Use @21hens-incharge link to look up hoop structures. They can make great runs that are secure and quick and easy to build. Given that these are probably fairly young chickens and you aren't tied to them through winter, you should then be good until you can get yourself a real coop built/shed converted or whatever.