So I stayed overnight with a guy for the first time...

We had a great time. We watched a movie and hung out, which led to making out, which led to me eventually waking up in his bed the next morning. However, at one point, I tried giving him a blow job (my first time giving, ever). I think I was terrible. Really bad. He handled it really well, and didn't flat out say that it was awful, but I think it was the only hitch in an otherwise perfect evening. How can I get better so that the next time I'm with him, everything is great from start to finish? Any tips at all are welcome, but small details like "play with his balls" are of lesser concern to me than laying a basic foundation for a great blowjob. I guess I'm looking for the absolute minimum for now, to build off of in the future.