As for your weight... you could be 185 at 5 foot 10 and be OK... I haven't seen your build/how fat you are etc so I can't really say.

What ever details though... you can't be that overweight at 5 foot 10 unless all of your mass is fat (you said you were fairly athletic though didn't you? )... so basically just focus on your conditioning... how you perform etc and your weight will sort itself out.

Just get training!