If you get an entry level machine with a readout of any kind,it will be lying to you a great deal of the time anyway. SOUND...even on a mono-tone machine such as the Tesoro Compadre,is THE most important aspect of coin hunting. This point could be argued if you were to throw down 2 grand on a CTX,but other than that,audio is king. The QUALITY of the monotone...is it full and solid or weak and clipped...the most important thing to learn as a beginner is WHAT a coin sounds like. If you are paying attention to numbers or a needle that is wavering all over the place a lot of the time,that will do you NO good.
The VERY most important thing besides the machine itself is having a place that actually HAS COINS! This can be more difficult than you’d think,depending on who you have in your area who also hunts coins. But without a machine,you’ll never know if they exist around your area or not.
The Compadre is a great discriminator,which is what you’ll need in modern parks and schools,or even old ones for that matter. That would be my own recommendation for someone new. It is extremely light,simple to operate,runs a long time on a single 9 volt battery and has a lifetime warranty,all for around 160$.