The best of luck to you, bud, in your new endeavor! Really the best advice I can give you is: Once you have determined which coins you are interested in through your due diligence, wait to enter after at least a 60% correction of the ATH. Resist not to this with your entire being, lol. If it leaves you, there will always be others. Don't learn this the hard way like myself and thousands of others.
To answer at least one of your questions, I believe coinmarketcap has a pretty good mible app.
That's a great tid bit too, and sounds like great advice especially with all the volatility in the markets.