It may be your first but if the bug has you it won't be your only one. I started with a 10 gallon, I still have it but I now I also have a 29 gal. and a 55 gal. Fish are absolutely wonderful. I love mine. I hope you get as much enjoyment from yours as I do mine.
Misakitty's 15 gallon freshwater fish tank, Main Tank
InsaneIchthyology's 75 gallon saltwater fish tank, Saltwater