You will derive more from the experience of attending a conference if you have work to present and this will be best decided by discussing your interest in presenting your work with your research advisor. If both of you decide that you do have something vital to contribute then you need to consider some practical issues including which meeting you will attend, what the cost of attending the meeting will be, and whether or not there are any funds available to support your travel to the meeting. In general local or regional conferences are less expensive than national conferences and their location may eliminate travel and lodging.
You don't have to present at a local meeting before you consider presenting at a national conference though the experience of presenting at a local or regional meeting may help you hone your presentation skills and improve your self-confidence.