I really like this guy, and he's been one of my good friends for a few years. He's been openly gay for about a year, and I'm thinking about asking him out. I've never really asked anybody before,and I have no clue what to say lol.
Try to find something you and he both like and inviting him to go for that. It could be as simple as going for food/drinks (non-alcoholic... , a scheduled concert/festival, or an activity like playing video games or bowling.
I agree with Resu; start real casual. Dating starts as a get-to-know-you thing. (I think) So just pretend that it's hanging out, only not at one of your houses.
If you're not out to him already, then he may think you just want to hang out as friends so make sure you're clear about it (unless you want it to be really casual for now.) Good luck!