Gograth, considering you're getting back into it you should look at the Summer Escalation League post here on the same forum. Should be 2 or 3 down from this Topic. It would probably the best way for you to build up/test your Orks in the field over the next 3 months AND get fun games in with people expecting to play at the same level. And it even has the painting/Stratagem rules so there's a neat bonus if you can get your forces painted up in time for each month!
By the end of it you'll have a 1250pt army you likely feel very solid with and can build on it from there to get up to any higher point games you'd like to be ready for.
Will look forward to seeing/playing in the coming weeks, get your 500 points of orks together and you can even play while you assemble/paint your new models! Folks tend to have rulebooks on hand for games and the guys have been very good about helping new guys get acclimated to the rules. I had been a 2nd edition Space Marine/Squat player and was having to relearn everything for Tau
