In Road to Power, players must write every ad they wish to produce. The up-shot of that is there is a greater variety of ads then before, and a more open-ended way of spending money on them. These are the guidelines for each type of advertisement:

Television
Cost to produce: $25,000
Cost to run: varies
Word limit: 125 words spoken
Let's face it, this is the most common ad out there, and the most expensive. 60-second ads have no more than 100 words spoken or so, and 30-second ads have even less. So, you have a spoken word limit, but I do not limit you to the number of words used in the script (stage directions, image descriptions, etc.). But go over board, I'll let you know.

Radio
Cost to produce: $7,500
Cost to run: varies
Word limit: 125 words
For radio, there are no stage directions, it's all spoken words. Not very effective ads, but you get what you pay for.

Newspaper
Cost to produce: $7,500
Cost to run: varies
Word limit: 500 words
These cost more to run than radio ads, but can be more effective, especially if there is some art involved. Also, the market has made the national newspapers extremely expensive, compared to the local buys, where as radio is more uniform.

Direct mail
Cost to produce: $2,500
Cost to run: $500 per thousand
Cost breakdown: 39 cents postage, 7.5 cents copying, 3.5 cents overhead
Word limit: 750 words
Cheap to produce because it is essentially just mailing someone a letter to stir them up into voting. The cost is fairly cheap, but can pile up quickly as you try to reach a larger audience.

Campaign literature ("fliers")
Cost to produce: $5,000
Word limit: 150
These are a staple for any campaign wishing to canvass or do door-knocking. They are relatively cheap to produce, except they are on glossy paper and in color, so cost more than direct mail. Good news is the cost to run these are built into the cost to canvass, which is the only way you use them.

Required language:

On candidate television and radio ads
"My name is (candidate name) and I approve this message."

On candidate newspaper/direct mail/fliers
"Paid for by (candidate name) for (office currently sought)."

On all PAC/Party ads:
"The (organization) is responsible for the content of this advertisement."

Required thread labeling:

(Candidate or organization name) (medium) (ad number): "(title)"

Such as:

John Doe TV Ad #1: "Bio"
or
Federal PAC Direct Mail #3: "Taxes"

Labeling your threads this way will allow me to know how to find your advertisements when evaluating them.