This book covers Swedish 1 - 4.
Dictionaries:There are several dictionaries from Swedish to English, for example Prismas Engelska Ordbok or Norstedts lilla engelska ordbok (also available in "pocket" edition) from about 100 Skr - 200 Skr. Or use an on-line dictionary, available for instance at www.kreativpedagogik.se. On this web address you can also find other useful materials as the easy-to-read newspaper 8 dagar, general information about Sweden, on-line courses and exercises etc.
Of course all kinds of authentic materials like informational texts, newspapers, literary texts and audiovisuals will be used!