I think exactly FAQ answer directly your question:
Let me post it also here so that in future if there would ba dead link it would be clear
With a Bamboo Starter License, you are restricted to 10 build Jobs, and 0 remote agents, but can run unlimited local agents. A Job is a single build unit within a Plan. One or more Jobs can be organized into one or more Stages. Given a 10 Job limit, you may distribute your Jobs between up to 10 Plans - for example, one Job per Plan or all 10 Jobs within one Plan. There is no limit on the number of times a Plan is built/executed.
Please note that use of the Plan Branches has a multiplicative effect on the number of jobs configured, and therefore an effect on the 10 jobs cap. For example, a plan with two jobs that is building against a total of three branches (the plan's original branch, plus two additional branches) will contribute 6 jobs toward the limit.
Here is a description of Plan Branches
Here is how you can check how many jobs are you running
Hard to say since I do not know your branching structure.
The best way is to install free 30 days evaluation of Bamboo and explore all the options, connect your websites, test if everything is working as you want and finally check how many jobs are you using (using the method that I shared above). Thanks to that you would be sure and after 30days you can buy a starter license if everything would be good for you.
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