New user, seeking some advice

I bought the Aneros MGX about a week ago and it arrived yesterday. Since then I have been able to use it twice. The first time was just before I went to bed, and it was more to get myself acclimated and figure out what it would feel like. Slightly uncomfortable at first since I've never used any sort of anal toys, but after a few minutes it wasn't really a bother. The second time was earlier today for over an hour. During that time I got a number of interesting and new sensations, and both times I got a little bit of precum. So I know something's happening! Both times I was in the one leg stretched out, one leg pulled up position from the instructions, though the second time I (unsuccessfully) experimented with positions a bit. I tried alternating between periods of small muscle contractions, larger ones, and simply relaxing. While none of them really worked, I'm not discouraged.

In any case, I'm just looking for some advice and tips from the more veteran users; I'm hoping the third time's the charm. There were a bunch of times where I could feel my pulse against the Aneros, but other than an interesting rhythm it didn't really do much. There was a certain spot (spots?) that I hit where the feeling was much different. I could feel my pulse, but then it felt like there was another pulse or muscle spasm on top of that and staggered so that it felt twice as fast. I get the feeling this is important, I'm just curious how.

I'm also wondering what would be good for self-cleansing and/or lubrication before use. If possible I would like to find something at a local pharmacy, but I won't shy away from online ordering (within reason, naturally).

Thanks!