Message from Mars will have 24 story pages, plus additional pages that will include extra information and art in each issue.
Yes, you can increase your pledge above the tier you have chosen to get additional copies of issue #1.
After the campaign is finished, we will send you a survey so you can tell us what add-ons you wanted based on the amount you increased your pledge by as well as your shipping information so we can send everything to you.
Everyone that backs the campaign at the Frontier Drifter($5) tier or higher, will receive a PDF of the supplement for free.
Don't see the answer to your question? Ask the project creator directly.