Yes, you can purchase an Electronic Ticket even if you have baggage to check-in. Just go to the Check in counter the same way you would if you had a paper ticket. If travelling overseas you must ensure that you have all the necessary documentation for your trip. This may simply be a visa for the country/ies you are visiting but it may include other things such as proof of financial support for the time you will be away and/or a return ticket etc. If in doubt please check with the nearest airline office or travel agent.