Blockchain Template / Guide to get started with a Custom Blockchain?

[plorph]

I would like to develop my own cryptocoin on its own blockchain and I was wondering if there is a base template software or even just some developer tools to help. I don't have a problem building it from scratch but that would take significantly longer compared to using a pre-made template or even some software suite I'm not aware of, any suggestions? I know how to create custom tokens and contracts on top of ethereum for example but im interested in developing my own blockchain. Even a guide to do it from scratch would be useful. Thanks!