Are complex test scenarios with JMeter possible?

I need to run performance tests on a web application and was wondering if the following can be accomplished with Apache JMeter.

I need to simulate approximately 300 users accessing an application over a set time frame (e.g. 300 users over 10 minutes) and doing some actions, for example:

• Logging in
• Navigating to different pages
• Inputting data
• Submitting forms

I'm quite new to JMeter and performance testing in general and was wondering if this is possible? Otherwise are there any better (free) alternatives?

Many thanks.