Initial Dan

Hello, I am new here to the site. I just bought my Rx7 2 days ago. I got it for 500 dollars. Needs a trans pan gasket and some TLC. From what I have been reading its a pretty rare option. Sun roof, Factory CD player. A/C Power everything. The package brake system. I am impressed. I had a 2002 Honda S2000, loaned it to a friend for a date and he crashed it. So....here I am. Few things I am not sure about is the hold button on the shifter. I know that the "Hold light" is like a check engine light but what is the actual button for? I will be doing some shopping for some basic interior parts. Plans are to paint and restore. Any links you can offer for some quick help would be wonderful. Thank you for your time. Now I need to find some basic topics to post in so I can get 4 more posts so I can post in the technical thread. HAHA.