Different powers allow you to knock your target prone.
If a player wanted to knock himself prone along with the target, I'd do a STR vs. FORT role with the DMs helper, +2.
I really like the way the RAW allows you to improvise without having to find an official answer for everything. In my...
At 5th level a character is +2 in all stat checks. So at a +2 for level and a -1 for the stat bonus, a level 5 cleric with an 8 Wisdom is +1 on all Wisdom stat checks.
Note that if a power says to apply the Wisdom bonus, a -1 applies.
This is what I've gleaned from my glance of the quickstart rules.
1) what does 10/20 mean on a ranged attack?
The first number is normal range. The second number is long range. Distance between the two ranges impose a -2 to the attack roll.
2) what if the cleric/rogue want to pick up a shield...