Hello.
i'm loking at starting a new Ork Army, but it my first time back to warhammer for a some years, and the only orks i have are the ones from the starter set about 12 years ago (the one with 20 orks, 40 gretchin and 1 cardboard cut out of a dreadnought

)
So i'm looking at starting an ork army simply as they look the most fun. I want something small to start with around 500pts, that i can build onto at a later time.
I think a good foundation is:
1 warboss with Choppa and slugga + eavy Armour= 65pts
15 slugga boyz 1 rokkit= 100pts
15 slugga boyz 1 rokkit= 100pts
15 shoota boyz 1 rokkit= 100pts
but i'm not sure about the rest, could you give me some advice please, even better a list