You can go with the basics from YYE
they are great and will work for both responsive and unresponsive. If you are trying 4A .. i would recommend 100% cotton. Other wise I would say order a little of 50/50 or 100% poly ... its personal preference and no one can really tell you how to choose, thats something you should decide
Same goes with the string companies :
I personally like toxic markmont dragon strings because it whips and slacks great and its not as FAT or THICK .. as toxics normal hand made strings are.
Kitty string, Chaos (stiff), Kevlar (lasts a while) are also great ... IMO - I noticed a huge difference with Toxic strings .. which is why I use them most... if i Don't have toxic... I just use my regular YYE strings.
Again, I would really recommend you order like the least amount from each company to try your self. If you can't buy then you can also try the b/s/t ... not really a place for strings but you can always .. post saying you want to buy different types of strings. Hope this helps