Headphones: You have 2 different needs there, headphones for the engineer (you?) during recording, and headphones for the musician(s) being recorded. A short while ago I created a thread called
Headphones for Mixing... where I was focusing in mid to top-grade headphones for my intended uses (not-recording) so it includes a fair number of semi-open and open-back headphones you probably shouldn't consider. But the discussion will be somewhat informative anyway and hence worth reading to avoid repeating too much here (imo). Also you maybe don't need ANY of those headphones on that list if you haven't anything to work from already, but the information is still worthwhile. If you're on a VERY limited budget I would probably consider a budget pack (or etc) of headphones, some retailers even offer packs that include the headphone amp such as this
AKG MiniAMP / K99 Headphone Two Pack or this
Sennheiser Sennheiser/ART Studio Headphone Pack (both chosen from a quick site search, not necessarily putting my recommendation behind them). I would consider my 'engineer' set of phones a separate purchase...
I would personally choose to use 2 different monitoring 'sends' as well, leaving the engineer's as flexible enough to monitor what you need and then use an actual 'send' (usually used for effects by digital folks) for the musician to hear him/herself in the context of a 'mix' that makes sense for them. The latter is important because they may request to be louder in the mix, or perhaps to just hear the main instrumentation and drop the fluff in the background that's obscuring their sense of tuning, etc. As for the former (engineer's send) how this works will differ on how you setup your routing, whether you focus on one of the larger STM mixers in Scope or just want to cable it all together using dynamixers & micromixers. Any one of these aspects could be an entire thread...
How to go about getting those sends out...is yet another discussion. Probably your 'engineer' monitoring chain will be the same signal that's sent to both your physical monitors and your headphones. Getting a monitor control that allows for a headphone output as well as muting/attenuating your physical speakers used for monitoring will be a big help. And then to get the send out to your musicians...well you might want to consider using one of the behringer ADA-8000 units or something similar. You'll get more than your single set of sends as a bonus, which could be useful both in other ways.
Lastly for monitor control, you have a HUGE variety of options from active to passive, cheap to expensive. There was a recent discussion here also titled
Mackie Big Knob vs. SPL Volume 2/8 which focused initially on the Mackie as the 'active' example and the SPL unit as the 'passive' model, but I believe a large number of options are covered including the final 'DIY' route that the thread stands at currently.
At the end of this you're going to wind up with a huge gear list, which I think is common for most of us. Write down your options for each stage and plan purchases carefully, with an eye to both keeping your current budget under control but also getting something flexible enough to not limit you in the long run. $19 headphones for your musician are not going to be a help if you have to toss them out anyway due to leaking into the mic at the volumes the musician wants. Opting for a 'budget' $150 monitor controller and then tossing it later realizing the $350 unit is more to your needs, wastes that $150...etc.
......Anyway back to feedback I was starting to think that if a serious take was done would I be best to get a headphone amp, mic up, turn the speakers down amd record while monitoring through headphones? - Is this the best way forward? - Or is it best to have the signal coming through the speakers? - I thought there was a feedback loop being created by the sound coming out of the speakers then going bcak down the mic then out the speakers ad infinitum..... 
....After recording someone on guitar and getting feeback - I paused, thought about it all and realised that it may be best to turn the speakers / monitors down.
........but from Behringers site it's for folks who don't have enough outputs,,,,,,,,,,,,
