I've also been creating a programming language recently [1]. I'd recommend looking into the pypy tool chain. It makes it pretty easy to hack together a decent interpreter (that JITs). That and rply for the front-end gives you enough tooling to be dangerous. Here's a good tutorial [2].

[1] https://github.com/DanielWaterworth/plastic

[2] https://morepypy.blogspot.co.uk/2011/04/tutorial-writing-int...