Electrum wallet is just fine bud, though I personally use mycelium wallet which also is a great wallet, Electrum is another outstanding wallet as well.
Since you are just starting out, those wallets are good enough, but the best wallets is hardware wallet because they are offline when not connected, but I don't think you can afford this type of wallet right now, so just stick with Electrum or mycelium, which ever is more interesting to you.
One thing I discovered from the exchange platform is that the buying price is higher than the selling price.
This is the norm, buying price is always higher than selling price, to me, this is one way to discourage people from buying and selling off immediately, as one can not do this without incurring some loss, though the main reason for this is in the buying and selling orders placed by traders, those are buying are placing orders at a lower price while those selling are placing orders at higher price, this the major reason why you sell at a bit lower price if you sell immediately after you bought.