Best bet is to hit your local guitar shop and try them out first each one will have its own neck profile and play ability to your liking. If your on a budget look for a use 7 string I recently pickup a used Ibanez rg7421 off of Craigslist for $120 usd. Also I see alot of used Douglas 7 strings 727 for around 100 dollar mark never tried there guitars but for the price it would be worth a look.
It's not the site you have a pup in your browser cache or history I had the same problem even with antivirus and malware protection programs it didn't pick it up. I found ADW cleaner and it took care of my problem it's owned by malware bytes.
There's no quick way other than just practice give it time and you'll pick it up. The first guitar amp combo I bought sat in a closet for a year before I decided to really devote time to it. Took about a year but final got to where I could play a song without my wife laughing at me and when you pick it up you'll be like dam what was I doing it's so easy now.