Start with the Multimedia Quran website. This site gives a small description of the differences between the Perfect Tense and the Imperfect Tense (which is the present tense in Arabic). There is also a lengthy chart at the top of the page. In the chart, you can find a list of English pronouns, Arabic pronouns, and their conjugations in both the perfect and imperfect tense.
Log onto the Speak 7 Arabic Verbs website for a more lengthy description. Speak 7 breaks down words in a step-by-step fashion to show you how a word is changed into the present tense. There is also a chart which shows the differences between singular, dual and plural present tense in Arabic. You will also learn the difference between masculine and feminine words in the present tense. At the bottom of the page, you will find a short description about the future tense in Arabic (see Tips below for similar description).
Use the lesson on Marhaba to see a long list of conjugations in the present tense. There are no lengthy descriptions on the Marhaba Web page. Instead, you see dozens of examples. This is a great site to visit after you've learned the basics from the two previous sites.
Finish with the Speak 7 Arabic Present Tense Web page. Once you've learned how to speak in the present tense in Arabic, you will want to know how to write these words. This page uses colors and numbers to diagram each step and is a useful tool while learning the Arabic alphabet.