For me, the job bank website was no different than indeed or dice or any of the N number of job search engines. It should send you an email asking you to enroll in the job bank website as a part of your EE entry profile creation/immediately after that.
"Are you eligible to work in this country or countries in which this position is located without employer sponsorship? " Answer choices: Yes/ No
No, you are not
CIC website states that the job should be full time, so your RA experience might not be added (I had >4 years of RA/TA experience where I was getting paid but I did not add that). I’m not sure about unpaid work. Remember that whatever full time experience you add you need to provide the NOC code and reference letters from employers for that.
Canadian-style is similar to US style.