Getting a chihuahua puppy with a black lab?

Question
Hello, I own a 11 month old female unspayed black lab and am wanting to get a 6/8 week old female/male chihuahua puppy, I will be spaying the lab in mid spring and will be getting the puppy before spaying her. I am currently living with a friend that owns a 10 month old spayed golden retriver/yellow lab cross, my dog gets along well with her and vice versa, my questions are.......

Should the puppy be male or female? I pefer females, I've never owned a male dog before and my family has only ever owned one male dog which was an Amrican escimo and was unneutered,

My lab is a very gental dog and just loves my mothers two bichon/shiztuz's (both are spayed females) which come to visit, the goldenX however seems to bully the smaller dogs, I may not be living with this friend in the spring and may not have to worry about the goldenX but in case I am still living here..... how do I get the goldenX to not hurrase this tiny puppy? what disiple methods should be used?, also my lab and the golden get purina dog chow, they have a full dish avilible at all times, they are normal sized and not over weight or anything but I don't want to feed the new puppy like this I want to feed at saspific times during the day.... is there a way I can get my lab & the goldenX to eat at sertion times during the day?

Right now we have a huge yard(theres a truck parked in it, there are three crab apple trees, two big & one small and three other trees back there and there is still plenty of room) but as I said in the spring we may not be living here, my lab doesn't have a clue how to walk on a leash as we've always had the large yard and I've never really walked her..... she pulls like crazy when on a leash.... how can I teach her without using choke chains and prone collars how to walk and not run on the leash? we don't have m,any toys for the dogs as they have each other to play with and everytime we get a squeaky toy or rope it ends up in shreds.... the puppy would need some small stuffed toys and small ropes..... how can I teach the two larger dogs NOT to eat them?

I've never owned a chihuahau before and since theya re the worlds smallest dog... at 6/8 weeks they have to be very tiny..... how can I teach my lab and the goldenX to watch where there going and not trampel the pup?

And lastly my lab sleeps at the foot of my bed and has ever since I got her when she was a three month old matnurised pup.... I have never been able to allow a crying pup to sleep on the floor and found it was never nessairy and they always slept up on the bed with me..... now my bed is rather high off the floor and a tiny chihuahua pup would be bound to pee in my bed when it finds out it can't jump off without hurting its self...... should I go ahead and leave the pup sleep on the bed taking the risk of an actident? or should I try to let the pup sleep on the floor near the head of my bed in a tiny bed with a clock?

Thank you for your help in advance.

Answer
I suggest you get your lab spayed as soon as possible as there is no reason to wait. I also suggest you postpone the acquisition of another dog at this point in your life. It sure sounds like you have your hands full, and you are not sure where you are going to be living. I further suggest you start obedience school with your dog. You will find it rewarding and educational.

Best of luck.