I went through the same experience a few years back(in the New England area). Given your first match with a more casual setting, I go along with the idea to shoot what you have and view your first match as a learning experience for this highly addictive sport.
There is some basic equipment and preparation that you will need.
-previously zeroed rifle with drops/wind holds readily accessible. Ranges are almost always provided.
-Magazine's to accommodate a 20 round stage.
-bipod, rear bag, other shooters will happily loan you specialty bags such as "game changers", "Tactical Utters", etc. you can then determine which ones you find most useful to you.
-a means to write your distances/dopes for reference during stages with multiple targets. This can be a simple index card, the back of your hand, or one of the devices/armbands designed for this purpose.
-eye/hearing protection, chamber flag
-back pack
-binoculars to observe/locate/familiarize targets prior to a stage.
Stages are will be 90-120 seconds and will be 10-20 shots. Reliable feeding and magazine charges are important. For your early matches a SFP can work but if you get serious a FFP, MIL based variable to 20-25x will be inevitable. Expect to have some reticle use only stages.
Overall, observe and converse with the other shooters to determine what fits your style.
This is an excellent reference:
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