I throw some flour into a bowl, what ever flour I happen to have. Wholemeal, plain, bread, its all flour. Then dump in how ever much sourdough starter I have currently minus a little. Finally add water until it feels roughly like dough, slightly on the wet side. Leave.

Come back later that day or forget about it and do it tomorrow, add some flour until it feels good and make the pizza base. Its just add flour/water until the dough can be formed into the right shape.