The most important thing is to avoid all sins, especially those committed by eyes, ears and tongue.
This requires knowledge (fiqh) and self determination (himmat).
For fiqh the books Bashti Zewar/Heavenly Ornament or Essential Islamic Knowledge (A handbook of Hanafi fiqh by Qadi Thanaullah Panipati, Allah have mercy on him) are fine.
For determination motivation is required. This is gained by being in good, pious company or reading from the books of or about pious. The Path to Perfection by Shaykh Masihullah (Allah have mercy on him) is a good book to start. Also posts on this site are a selection from these kinds of books. Try to read a couple of them daily.
Min fayuzaat e sayyidi wa sanadi damet barkatahum