Hey Lord, always happy to see a new player enter the fold. Stay positive, and try to learn something new every game. Pretty soon you will be the one making some new guy wonder how you owned him with a huge fleet before he got 3 planets.
Best advice I can possibly give you is this: don't shy away from games against skilled people. Make sure your autorecord is on, and when you see a player dominate a game or use a strat you'd like to incorporate into your own, go back and watch the replay from their perspective. You learn a huge amount this way. Also, some of the discussions on this forum (strategy, rebellion, and multiplayer) can yield a lot of great pointers for improving your strategy.
My steam name is the same as my forum name (Mr_Book). If you see me online send me a whisper I'd be happy to do a couple 1v1's and show you the ropes. I'm not the ultimate Sins player but I do hold my own pretty well in skilled games.