Hello Pattylou...I take it you have never owned a metal detector??? if not, I would not suggest going out and buying the most expensive, or fanciest machine on the market...Keep it simple to start off...I might suggest Bounty Hunter Pioneer 505 (Sharp Shooter II), Bounty Hunter Land Star, or maybe one of the new Titanium series coming out in July...
if the Bounty Hunter Lineup is not your bag, then I might suggest a Tesoro Compadre, or Tesoro Cibola, The White's Prizm V, or Minelab X-Terra 70
All of these machines are great and will find you most anything that is metal...If water or beach hunting will be your main gig, you might want to consider a Pulse Induction type machine...These tend to be on the more expensive side though...The final decision must be your own...I have only given you some suggestions to start on...If you have a local dealer near you (Google search for dealers and metal detectors), have them show you different machines and tell them exactly what you wish to do with the detector...They are your best resource of information...
Happy Hunting,
BH-LandStar