I've entered 12 tasks(issues) for my new project. They need to be done in order, my project is a waterfall project. Do I have to make each task a Blocker of the one before it to order my tasks?
If you have JIRA Server, I'm pretty sure you can use the free Script Runner add-on for this. You might create a new kind of issue link, with the set "precedes" and "follows". Use these links to order your issues, where any issue that must be done before other issues "precedes" them.
Then, choose an appropriate transition in the issue type's workflow (Start Work, or whatever your equivalent is), and add a Condition to it. Choose the Script Condition option, and then a Custom Script Condition. You should then be able to imitate the example script here:
Just change the LinkType value to whatever you called the link type you created. As-is, that script should prevent that workflow transition from being possible until all linked issues of that type are resolved.
I haven't personally tested this out, but if I had to set something up like you're describing, it's the first route I'd attempt.
-- Edit –
Just saw all the Cloud tags on your original post, and realized this probably isn't helpful to you at all. =(
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