Also on the forum there have been many similar questions with pages of answers and suggestions. You can search on various theme around new, newby, starter etc
Any decision you make should take your expectations into account.
It will be important to know what your typical terrain will be like. If you have narrow groomers, a shorter side cut radius (SCR) may be more practical than longer.
If you intend to use your board on various parts of the mountain, using a more versatile free board will probably be more practical than a race specific board.
Many start off with a single compromise board that provide a medium SCR and softer flex allowing for general carving on various parts of the mountain. Once you have decided what you prefer and want to spend more money on, the second hand market for boards is pretty robust and you should be able to resell well looked after boards pretty easily.
Last point: the shorter the side cut radius, the narrower the carve tends to be, all other things being equal, but you need to work harder as there are more turns in the same distance.
My 2 cents suggestion would be to look for a board of about 170 length and SCR about 12, but there are way more qualified people here to better advise you then me
This was my own thread 4 years ago which had some great advice in it: