I focus on the Daily activities: the Daily Clicks (worth $.15); the daily paid email (worth $.02); the daily videos (worth $.01 usually, but occasionally more); Radio Loyalty (worth $.01 for every 10 minutes of listening and filling in the captcha). There are also Daily Tasks (worth various amts)
You will find the Daily activities by clicking "Offers" at the top of the page and then click "Daily" at the top right of that landing page. This is the same place where the Daily Surveys are.
While the age of your computer might limit how many things you can do at once, it is your ISP that determine how fast you can do all that is available to do. If you have a cable broadband connection, you should be okay dealing with the videos and Radio Loyalty. If you use dial-up, it will be difficult to do these.
Another source of funds is bonuses. Check out the Contest and Promotion section of the Forum. The best bonus is the $3.00/month you can get for posting at least 30 meaningful posts in the forum. You have to request the bonus.
I try to get 40-50 posts each month to make sure that I have at least 30 meaningful posts. Try to do 1-2 each day. Then I request the bonus on the last or 2nd to last day of the month. The bonus, if awarded, is credited to your account towards the end of the month FOLLOWING the month you requested it.
There are also mini-contests each week (worth a couple of cents) and a $1.00 bonus for posting a screenshot of your proof of payment.
When you have the daily's down pat, and want to venture into the real "Offers" check out the Offers section of the Forum for clues where easy/successful (or not) offers might be.
You need to have at least $25 in your account balance ( of which at least $15 comes from offers) to cash out. You can see what your balance is by looking at your account page -- in the lower left hand portion of the page. It also gives you the split between offers and bonuses.
The daily click, daily email, daily tasks, video, and surveys all count as "offers".
Good luck with your efforts!
You can learn a lot by just reading the forum queries and answer. Spend some time reviewing the training videos and the Beginner's Guide (top section of the Forum).