Help making 1k list please

I currently own the following models and want to make a 1k list and then know what to purchase moving forward to expand the army.

Appreciate any help

Warboss

Painboy

Weirdboy

Bannernob

Bigboss

Wartrakk

Boomdakka snazzwagon

3 x deffkoptas

3 X warbikes

Big mek dakkarig

10x gretchin

60 x boyz

10 X beast snagga Boyz

5 X tankbustas + 1x bossnob