newbie need advice

My advice? Patience and keep going.

I'm a straight male but have enjoyed anal play since my mid teens. I think this led to my quick results with the Aneros.
You may have been better off starting with something smaller which might have generated move movement. I started with
a Helix Trident but moved up to a progasm Black Ice within a couple weeks. Bigger worked better for me but my
rectum echoes when I fart 😉 Bigger seems like a good idea but, reading here it's more about the movement to a lot
of users. If size causes discomfort it's probably going to be a distraction.

I have my best sessions lying face down with my legs spread just a bit. On my back with my knees up I get more
automatic motion of it but less intense O's.

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I would recommend that you start smaller and work up to the larger sizes. My first was the MGX and eventually I purchased other models. I recall the day I opened the box with the progasm and thought to myself "wholly shit that's big" On the package the writing said "Be Brave" Now, the progasm is my favorite hands down.
I use several models during each session always starting small and working up to the progasm. One time I decided to start our with the progasm and found it to be quite uncomfortable almost painful and had to take it back out.
A model like the mgx or eupho might be a better start

Thanks. Im not planning to purchase any other model anytime soon. There is a lot of movement i can generate with both models. More so with the trident than the progasm. But even the progasm i feel the movement with each anal contraction. But now that i have both, am uncertain which to focus on.. i havent tried the face down so will do that. The sensations are nice, just dont know what my goal is or what to expect. Do i keep doing the hold release over and over until something happens? I do not have pain with either model once i get it in.. it feels quite good to be honest..

The feelings are somewhat pleasurable and i tried doing them for like 15-20 mins and then am bored and called it quits. Have had 3 sessions so far... any advice?

IMHO, once you start to get bored you might just as well end your session. Trying to push through any boredom in hopes of gaining an orgasm is futile. Aneros use is very much a mental game and your ability to stay focused upon the subtle sensations being generated is very important, please see Aneros: The Essential Mind State. With more practice you will be able to stay focused for longer and longer periods, eventually it will become almost automatic for your mind to get into the receptive state for your body to take the lead and flood you with exquisite sensations of pleasure.

Which device should i focus on?

The choice of model to use is really only one you can make based upon your own intuition. The basic guidance I give is to follow the path of most pleasure derived from the least effort, this is allowing your body to lead you in the optimal path.

Do i do nothing or is it okay to kegel and release (which moves both device quite noticeably)?

Either method is perfectly OK, be adventurous and explore a number of techniques to find a combination which will unlock the door to your orgasms. There is no particular formula which works for everyone, please see Super-O Myths & Illusions.

What position works well?

You'll just need to experiment to find which positions work best for you. Personally, I find on my back, with some slight lumbar support to raise my butt a bit, legs bent about 90° at the knees and feet about a shoulder width apart works well, but that is just one of many possible positions. Again be adventurous and experiment, you'll find a few positions which just seem to work better than others.
Good Vibes to You !
P.S. I sent you an introductory message with some additional hints and tips to get you started here. Click on your 'Messages' button in the Forums to retrieve it.

Thanks everyone. Great advice. Ill have to find more private time before i start more sessions. Its hard with work and the kids. I may enjoy my sessions more once i have the right setting. I had thought it was mostly a physical sensation and after reading more posts realized there was actually a lot of mental involvement. I havent decided whether ill stick with the maximus vs the progasm. Ill probably go with the smaller one first as i saw a small red streak when i had a bowel movement later today. Im not too freaked out about it as ive had it intermittently even before i did aneros. Probably trauma related... once im more a pro inserting the maximus then ill use the progasm more frequently.. both give me a nice sensation once its in but found insertion of the progasm a bit more uncomfortable.