You need not create another ts for the new rbs; you can create it in the same rbs. The size of the ts would depend upon the # rbs and their sizes (based upon the transaction size --> which depends upon if the db is OLTP or DW/DSS) you have in the ts. For now, resize the rbs dbf to say 0.5 to 1 gb. Turn on Autoextend, and create the rbs with an optimal storage parameters.
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Ex. if optimal = (say) 10Mb, then set initial_extent = next_extent = 1/2 of optimal size. In this case, it would be 5Mb. Remember that extent allocation (esp for rbs) is CPU intensive.