Question: How to solve a first order ODE numerically?

Hi,

I want to solve a first order ODE and (i) plot phi vs. x and then (ii) export data of the plotted curve as an T-shape ASCII file. I try to do this by Maple, but there are some errors and I couldn’t get the mentioned curve and ASCII file. Please, help me to remove errors:
(dphi/dx)**2+2*V(phi)=0,

where V(phi)= (1-alpha)*M^2 - (1-alpha)*M*sqrt(M^2 - 2*phi) + mu*(mu + beta*nu)*(1 - exp(phi/(mu + beta*nu))) + 
            (nu/beta)*(mu + beta*nu)*(1 - exp(beta*phi/(mu + beta*nu))) + (alpha/gamma1)*(1 - exp(-gamma1*phi)),

where we assume mu := 0.01, nu := 1 - mu, beta := 0.05, alpha := 0.3, M := sqrt(0.704), gamma1 := 0.001.
As it is seen from the attached figure, V(phi) and dV(phi)/dx =0 for phi=0 and phi=phi_m (two extreme points of V(phi)) and d^V(phi)/dphi^2<0 at phi=0 and phi=phi_m (phi and x are real). 

From the attached figure, it seems that phi=phi_m at x=0 and phi->0 as x-> infinity. (Hint: I expect the plot of V(phi) vs. phi and phi vs. x be similar to the curve "A" in the attached file).

Thanks.
rk4.mw