Go to http://paleo.anglo-norman.org. Click on the coin on the right representing "early-modern paleography," then from the menu on the left, "The alphabet." As you move the pointer over the Secretary letters, the box in the upper left gives the modern letters. Then click on the box in the lower left of your screen labeled "Forms (cursive)" to see actual sample letters that you are likely to encounter.
Pay particular attention to the lowercase c, e, h, r, s, u/v, w, and x.
Most numbers are likely to be written in Roman numerals, but with three interesting differences from the modern approach:
Prior to 1752, the first month of the new year in the church calendar was March. Accordingly, January was the 11th month and February the 12th month in that system. The months ending in "ber" were not names but numbers reflecting this situation.
The 1 may be dotted or appear to still be an i as in i72i for 1721.